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fuck you up means that you are fucking pissed at someone and you are going to beat them...punch them or whatever
Dude you're so fucking annoying I'm going to fuck you up.
by Billy joe huff July 03, 2008
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Something you say when you are sexually attracted to someone and want to have sex with them. Saying what you’ll do once you get the chance to see someone you like.
You are so fine, I’m gonna fuck you up when I see you.
by Woops September 09, 2019
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