Top Definition
FUO
Flipping U Off
Andy: LIRL!
Brian: What the hell is LIRL
Andy: Laughing in Real Life!
Brian: that's stupid
Andy: FUO
by elleniszizes March 30, 2011
1 more definition
FUO
Flipping U Off
Brian: You're a slut
Andy: FUO!
by ellenislaurenzizes April 12, 2011

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