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

by The B-rad October 14, 2006

knucklehead

someone who is irresponsible and acts ignorant

Don't be a knucklehead you understand what's being said.

by Gerard Irick October 21, 2010

knucklehead

the punching of a boner in attempts to make it go away.

dude I got a boner in the parking lot so I gave myself some knucklehead to make it go away.

by knuckleheadwittness February 20, 2012

knucklehead

An honors physics student of ability but who lacks the conventional expression of said ability (i.e. homework completion, class appropriateness). May or may not get high grades.

6th period lost its elder knucklehead after 1st semester

by Pelota January 30, 2010

knuckleheads

A group of people who have nothing better to do with there lives so they just sit around and tease each other!
Haha But either way you wanna put it we still rock!

Examples of Knuckleheads are the following as it states:
Airhead(Quiana),Blondie(Loralye),Brodie(Candice),Mrs.Ganja(Sanonie),Spam(Rosalynn),Lunatic(Angelina),Baka(Jessica),Dumbshit(Sheryll:)
We Rock Major!

by xp_brodie June 28, 2009

knucklehead

A playful name to call someone, mainly done by the mentally challenged

by Anonymous October 14, 2003

knucklehead

A dickies wearing, cheap flannel shirt wearing, gangbangin Mexican with a shaved head. Almost always act like dicks.

Ah fuck dood... I was cruisin outta school and this big fuckin knucklehead came up to me and was like 'Eh Vato, Gimme your pinche money esse!' So I yelled for la migra, and wouldn'tcha know, the mafacker ran away! Fuckin hate knuckleheads.

by Mecosking February 8, 2008