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A mental illness that makes a person say 'fuck you' to everyone and everything all the time.
Person1: what's up man.
Person2: fuck you!
Person1: dude, you have a serious case of fuckyounism. You should see a shrink.
by NewEnglisher July 21, 2012
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Sep 8 Word of the Day
A casual invitation / threat used by an individual that is not afraid of fucking someone up.
PAUL: I'm going to beat your ass.

JACK: Fuck around and find out, fool!
by NX STARCHILD October 16, 2020
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