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1. fku
shortened version of the words "Fuck You" generally used online.
hey ralphan00b fku cuz
2. fku
True response to Mizzou's chant MIZ-... Meaning "Fuck Kansas"
Brady: Did you hear that jayhawks drink their beer warm? Its because the only KU grad that knew the recipe for ice graduated. MIZ!
Will: FKU!
3. FKU
fat kids united, a clan or a group of fat kids that think that they are ghetto
a bunch of fat kids being ghetto and making a clan, aka FKU
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