Top Definition
Fuck Bitches Up. Used by one group of girls to threaten another.
"Are you going to that Powderpuff football game tonight?"

"Yeah, the Seniors are gunna fbu!"
by mousefacee November 23, 2009
Chat speak = Fine By Us
Online friend one: I'm gonna run to the store. I'll be back in a few.

Online Friends 2: FBU
by DorianGray April 10, 2008
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