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 08, 2008
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 13, 2006