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A dumbass, or stupid person. Usually said after a stupid remark.
King Kurry VII: I was at the haircut store when...
Beanerous Brokus I: You mean the barber shop you muckfluck

King Kurry VII: That Open latte was phophylactic
Beanerous Brokus I: You muckfluck the sign says Open Late
by Beanerous Brokus I December 11, 2005