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knucklehead 

a person who doesn't listen, and stays in trouble
Dat boy a knucklehead he stay in trouble.
knucklehead by J-Wilk May 21, 2007

knucklehead 

Engine produced by the Harley Davidson Motorcycle Company from(1936 to 1947). The engine consists of an overhead-valve v-twin design with covers on the valves that resembled knuckles, hence the name of "knucklehead".
Mike's knucklehead got repo'd after he missed his second payment
knucklehead by The B-rad October 14, 2006

Queen City Knuckleheads 

A Cincinnati, OH. based street gang, known to destroy parties by setting things on fire and shitting on the floor. They have also been know to drink white lightning and burn themselves with forks. They fight for justice and live to protect the pop punk scene. The Knuckleheads are also know to eat the feces right out of a bums ass in the middle of the street. Chances are if someone has ever ate your poop, right out of your butt, it was probably a member of the infamous Knuckleheads.
The Queen City Knuckleheads believe in equality and posi-core music. Don from the Messengers is the leader of the Queen City Knuckleheads

Knucklehead-McSpazitron

a dork! a loser! a Knucklehead-McSpazitron!!

Knucklehead 

A nickname associated with fans of the heavy metal band Five Finger Death Punch.
Judging by his 5FDP shirt, he must be a Knucklehead.
Knucklehead by Tank238 October 15, 2012

knucklehead 

Don't be a knucklehead you understand what's being said.
knucklehead by Gerard Irick October 21, 2010