Urban Dictionary: knucklehead

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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

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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

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knuckle head

Someone who has just made a mistake or done something wrong. Often used in a joking manner between friends.

After arriving at the ski resort Pat discovered that he had forgot his skis to which his friends responded "Pat, you're a knuckle head!".

by zantern June 22, 2005

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knuckle head

Someone of limited intelligence and with a mean nature. Who prefers using their knuckles/fists, to using their head.

That doorman looks a real knuckle head

by IanM September 14, 2003

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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