8
someone who is irresponsible and acts ignorant
Don't be a knucklehead you understand what's being said.
by Gerard Irick October 19, 2010
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9
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
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10
A member of one's social group that recently done something really stupid.
That knuckle-head Fred told me he feed his dog chili again.
by Steve Jobs May 27, 2003
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11
A young and wild skinhead, normally a fresh-cut, probe to getting drunk and getting in fights.
That fresh-cut, Jimmy, is going to get beat-up if he keeps being a knucklehead and pissing off the older guys.
by Blownaparte August 10, 2014
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12
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 29, 2010
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13
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
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14
A playful name to call someone, mainly done by the mentally challenged
by Anonymous October 14, 2003
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