Disclaimer: Not mine.
This would happen when you have at least a C level support between Rolf and Marcia. Marcia is Normal and Rolf is Bold.
Food For Thought
"Oh crackers! I forgot to get that vulnerary! Now what am I going to do?"
"Marcia, there you are!"
"Oh, hey little guy! What do you need?"
"Hey, I'm not little! I'm a top-notch archer now! Anyway, I got a vulnerary for you!"
"Oh hey! That's perfect! Where'd you get it from?"
"Makalov gave it to me. He said that it's a small gift or something."
"Oh, I see. Well, I'm going to find out what trouble that chowder head got into this time, that cheese ball!"
"Hey Marcia, why do you say that?"
"Huh? Say what?"
"Well, you use food instead of saying something like d-"
"Whoa, boy! Don't say it! Where did you learn something like that from?"
"Well, a lot of people, actually. Like sometimes Boyd accidentally slips and says it, but Oscar scolds him for it. And then there's-"
"Well, Rolf, if there's one thing you should learn, it's that you shouldn't say them. Especially if you're a lady, but I suppose that won't apply to you, now will it? Anyway, you should find something else to say in place of them."
"Like food?"
"Exactly! You have no idea just how much food works to replace those dreadful words because they sound like-! Well, it's a long story, so I'll have to tell it to you later. Right now, I have a scouting mission I should be doing for Ike. So wait for me, okay?"
"Alright! Hurry back!"
In a way, they do sound like curse words. At least in a time like this, where they use words like 'dastard' and 'cur' and 'blackheart' oh my! Thanks to BlueOrbiAngel for the convo!