A silly one-shot based on a discovery I made while writing my previous fanfics. I do not own Miraculous Ladybug.

'Okay, Tikki! Time to write in my diary!'

Marinette reached into a drawer and pulled out a semi-circle shaped box. She produced the key, unlocked it, and took out the pink-and-white spotted notebook. It had been a long day and she wanted to get everything down – the day's akuma attack, laughing and joking with Alya and Nino, the two whole sentences she'd managed to get out to - *sigh* - Adrien.

But when she flicked to the end of her notebook, however, she realised that she'd soon be needing a new diary. There was only one page left, which was nowhere near enough to describe Adrien's stunning good looks and his charming smile and his beautiful green eyes…and the rest of course. Come to think of it, that was probably the reason she needed a new diary. She had a tendency to waffle on about Adrien.

'Oh dear, Marinette. Looks like you won't be writing in your diary after all,' said Tikki.

'You're right. I guess I'll have to type it up on my computer, just this once.'

'Be careful!' warned her kwami. 'You can't risk anyone finding it. Nobody can read your diary! Unless you're going to leave out the parts about you being Ladybug and the Guardian of the Miraculous!'

'I'm not sure I'd want anyone reading my diary even if I did leave out the parts about being Ladybug,' Marinette laughed. 'Don't worry. I'll get a new one tomorrow, copy it out and delete it.'

'Okay, Marinette.'

Tikki zoomed over to Marinette's chaise and lay down to rest as her owner began typing.

Dear Diary,

Chloe tried to get me and Alya to switch seats with her again! As if! She's just jealous because she wants to sit near 'Adrikins.' She stole my sketchpad and threatened to destroy my designs if we didn't switch with her and Sabrina. Can you believe that? But you'll never guess who got it back for me! Adrien! He told Chloe to back off and it was four of us against two, plus Miss Bustier showed up at just the right moment. Adrien complimented my designs and asked me about them! He's just so perfect. I managed to say two whole sentences although I said 'plait' instead of 'pleat'.

Poor Mr Ramier was akumatized again this afternoon. I've lost count of how many times we've fought Mr Pigeon. Cat Noir was his usual annoying self. I do wish he'd stop calling me Bugaboo. I've told him not to, but he won't listen!

As Marinette thought about what to write next, she noticed something. She had been expecting a red wiggly line under the name Bugaboo. Cat Noir had just made it up, right? But there wasn't one. Which meant it was a real word. With a meaning.

'Hmm…' She highlighted the word with the cursor, and then clicked 'search'. Results instantly flashed up on the screen. She giggled in surprise.

'Hey Tikki, check this out.'

'Huh?' Her little companion had been taking a nap. 'What is it?'

'I just looked up what Bugaboo means. I wonder if Cat Noir knows he's been calling me that this whole time?'

Tikki floated over and blinked her big eyes at the screen.

'Oh!' she squeaked in surprise. 'That's the opposite of what Cat Noir means when he calls you that!'

'Exactly.'

A mischievous grin spread over Marinette's face. Patrol with her kitty later that night was going to be interesting…

Ladybug flew over the top of a building, landed gracefully on a rooftop, and caught her yo-yo neatly in her hand.

'Right on time tonight, m'lady.'

Ladybug spun round at the sound of the familiar voice. Cat Noir had assumed a cat-like crouch on top of the chimney.

'Hey, Kitty. I just couldn't wait to see you.'

His face lit up in surprise. He jumped down and bounded over, reaching her in two strides.

'Likewise, Bugaboo. What's put you in such a good mood?'

Ladybug smirked. He'd fallen right into her trap.

'I always look forward to seeing my favourite cat. And I was also hoping you'd call me Bugaboo.'

He narrowed his green cat eyes suspiciously.

'Who are you and what have you done with my Lady? Have you been akumatized? Because if you have…' He winked. 'I'll save you in no time.'

She giggled.

'Silly Kitty. Of course I haven't. Now…do you know what the name Bugaboo means?'

He thought about it for a moment.

'It means you're the girl of my dreams.'

'Are you sure about that?'

'Of course, m'lady.' His grin wavered. 'I don't like that look on your face. That's the look you get when you're planning to take down a supervillain.'

'Is it?' she said innocently.

'Yes. What's going on?'

Ladybug took out her yo-yo and brought up a search engine. After tapping a single word in, she read out:

'Bugaboo – meaning: something that induces feelings of alarm or fear.'

'Bug – what?' He whipped out his baton and searched it too. She shook with silent laugher as an expression of horror washed over his masked face. 'Well – that's – that's obviously not what I mean.'

'Synonyms include,' she continued, 'Pet hate, bane, dislike, irritant, aversion, vexation, thorn in one's side…'

'Stop! Stop that!' He shook his head, causing his mane of hair to become even more tousled.

'Oh, there's more.' Ladybug was enjoying herself immensely. It felt good to get him back for all the times he'd teased and annoyed her. She wished she could see Plagg's reaction too - he was probably finding this as hilarious as she was and would likely tease his owner when they got home. 'Here's another list: Bugbear, dread, hobgoblin, ogre!'

'Ogre?!' Cat Noir looked as if someone had just told him puns were illegal.

'You haven't even heard the best bit.' She scrolled and clicked on something else. 'It also means: Someone who bugs you all the time and gets on your nerves.'

He spluttered indignantly.

'What the…give me that!' He snatched the yo-yo into his claws. She made no attempt to stop him. His green slitted eyes widened, and his tail snapped in outrage.

'You have cat to be kitten me right meow.'

Ladybug exploded with laughter. He let out a deep growl, his black leather ears flattening against his hair.

'Well, at least I finally got you to laugh at my puns. And you know, this website isn't exactly the most reliable source of information, m'lady.'

'Don't you change the subject. I didn't know you were scared of me, Kitty. Or that you think I'm annoying!'

'Of – of course I don't! And I'm not scared of you!'

'BOO!' she yelled in his face. He continued to look unimpressed, arms folded tightly against his chest, tail swinging from side to side, while she doubled up with a fit of giggles. 'And you say I don't have a sense of humour.'

He stuck out his bottom lip like an obstinate child.

'I might have known you had a trick up your sleeve, Ladybug. That's why you were so pleased to see me.'

Ladybug felt a slight twinge of guilt. Perhaps she had been a little hard on him.

'You know I'm always pleased to see you, Cat Noir. I was just messing around.'

'Oh, I know, m'lady. I deserved it. I am annoying.'

'So you'll finally stop calling me Bugaboo?'

He scoffed.

'Nice try. You didn't think I'd give up that easily, did you? I'll call you Bugaboo furever. Even when I find out who you really are. Which I will.'

She rolled her eyes. His pride, although wounded, wasn't letting him admit defeat.

'Sure. I guess I'll have to call you Bananoir then.'

'Please do. You haven't done that since you said you would. I always thought you were a lady of your word.'

'Fine. I'll surprise you with it when you're least expecting it.'

'Can't wait, m'lady.'

She chuckled, shaking her head.

'Okay. Now, can I have my yo-yo back please?'

'Oh, sure.' Just as he was about to hand it over, he realised he'd absent-mindedly been scrolling down with a clawed finger.

'Wait a minute…' A smile spread over his face.

'What?' For a crazy moment, Ladybug panicked that he'd seen something that could give away her identity.

'There's another definition here. Bugaboo is A goofy, affectionate term you might say to a good friend.'

'Huh?' She prised the yo-yo out of his hands. 'You've just made that up.'

'Nope. It's right there,' He tapped the screen, the sparkle returning to his eyes. 'Now that's exactly what I mean. Got you back, Bugaboo!'

Ladybug stared at the screen, blinked twice, and sighed deeply.

'Okay, Kitty. You've got me there.'

'Sure have!'

She couldn't help chuckling at how pleased he looked with himself.

'Note how it says goofy.'

'And affectionate.'

'That you might say to a good friend. Which is what we are.'

'Yes, m'lady. And you're definitely not an ogre.'

She giggled and gave his hand a squeeze.

'Well, I suppose we'd better actually do patrol. Protecting Paris is more important than our petty arguments.'

'Wise as ever, Bugaboo.'

'You're a stubborn cat.'

'I know.'

Hope you enjoyed! The definitions were based off actual ones I found online. If you go and look up 'Bugaboo' you'll see what I mean.