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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.
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A dunce. A dummy. A very stubborn person or animal.
I told him how to do it, but he would not listen, the knucklehead!
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a person who doesn't listen, and stays in trouble
Dat boy a knucklehead he stay in trouble.
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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
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A nickname associated with fans of the heavy metal band Five Finger Death Punch.
Judging by his 5FDP shirt, he must be a Knucklehead.
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someone who is irresponsible and acts ignorant
Don't be a knucklehead you understand what's being said.
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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.
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