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1. flunch
aka fun lunch, a work lunch where drinking is not only accepted it is mandatory.
My TL drank a pitcher of Margaritas at our flunch.
2. flunch
A wierd french fast food resteraunt that is generally to be avoided.

Also a word that can be used in place of virtually any derogatory term/insult.
go flunch yourself

what the flunch

I caught flunch off bob

eat your flunch

you flunched my dober
3. flunch
To fuck. Also can be used as an insult.
Person A: "Want to go flunch later?"
Person B: "Sure! anytime"
4. flunch
A free lunch.
"Going to flunch, wanna come?" "Hell yeah!"

"There's no such thing as a flunch."

"It's flunch, but you have to tip."
5. flunch
a fucked lunch; a tasteless, ugly daymeal that makes you vomit or you feel a sickness, disgust, nausea etc.
What a flunch you gave me!!!!!!!!!!
6. flunch
An easy way to ask "what's for lunch?" to a workmate.
"Flunch?" or "Dude, flunch?"
7. flunch
having sex during lunch
i am going to flunch today with my boss