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14.
receiving a wicked blowjob while the woman masterfully utilizes her two hands in the dirty deed
Suzy gave me the most tremendous knucklehead last night.
by Headmonger August 14, 2008
 
1.
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
 
2.
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
 
3.
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
 
4.
a person who doesn't listen, and stays in trouble
Dat boy a knucklehead he stay in trouble.
by J-Wilk May 06, 2007
 
5.
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 13, 2006
 
6.
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
 
7.
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 January 26, 2012