Convobomber

An individual who derives great pleasure from being extremely blunt or unequivocal yet simultaneously witty and sarcastic in front of a group of fake-ass, two-faced people.

A group of parents are talking about how well their children are doing.
Sarah: "Oh yes, my little angel got straight A's this year. She was named top in her class and - haha - I can't say I'm surprised. Oh! Kacy, how is Susie doing."
Kacy: "Well, she's not giving blowjobs to nerds in the science wing bathroom so they'll do her homework, and she's not smoking pot behind the school like I've seen your kid doing. So I'd say she's doing spectacular!" Kacy leaves.
Sarah: "God what a Convobomber.