M is for Mom
"…And then we could stop by a restaurant so you can eat, then train, then I can drive you home. How does that sound?"
"Your mom."
There was a few moments silence, and then Stephanie had to laugh. "You've NEVER heard of a 'Your mom' joke?"
"…That was a joke? Strange sense of you got there. For a moment I thought you'd gone mad. And on your birthday, too…"
"And that would be such a shame, right?"
"I was actually looking forward to it."
Yermom
Noun
Slang for "your mom," which is the ultimate come back in any situation, but it is said so quickly that it sounds like one word.