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1. knucklehead
From the 1930's (circa). Refers to a person of questionable intelligence. The size of the brain being given relative size of a human knuckle. Similar to pinhead.
That guy just sat on a bench with wet paint. What a knucklehead.
by The Phat Doctor Dec 27, 2004 add a video
2. knucklehead
A dunce. A dummy. A very stubborn person or animal.
I told him how to do it, but he would not listen, the knucklehead!
by Merrily McCarthy Jul 17, 2003 add a video
3. 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
4. knucklehead
a person who doesn't listen, and stays in trouble
Dat boy a knucklehead he stay in trouble.
5. 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.
6. 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.
7. knucklehead
someone who is irresponsible and acts ignorant
Don't be a knucklehead you understand what's being said.
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