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!
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