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 December 27, 2004

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 July 17, 2003

knucklehead

a person who doesn't listen, and stays in trouble

Dat boy a knucklehead he stay in trouble.

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

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