Top Definition
shortened version of the words "Fuck You" generally used online.
hey ralphan00b fku cuz
by miGGi November 19, 2005
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!
by william quantrill December 08, 2010
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
by whit boi May 04, 2007

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