1 definition by The B-rad

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