Flunch, derived from the similarly-named fast-food chain, "Flunch", is a noun which refers to the object of oral human expulsion (vomit), or a verb meaning to "to vomit".
The reason this word means "vomit" or "to vomit" is because the restaurant is
absolutely revolting, serving up rotten mussels and frozen sweet products. After dining at the restaurant, if it can be
justified as dining, we
literally felt like vomiting, or flunching.
I feel like I'm gonna flunch.
Somebody flunched
behind the door!
Ew, I just stepped in someone's flunch!
That ride is
intense, last time I went on it I flunched.