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rude slang An abbreviation of "fuck you." ("You" is represented by the letter U, which is pronounced the same way.) Used as an expression of utter contempt, disdain, or disregard for someone. You know what? FU! I'm done with this conversation. A: "You're just a big crybaby." B: "Yeah, well, FU!"
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.