Knucklehead 

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.

Knucklehead by Blownaparte August 10, 2014

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

knucklehead by Pelota January 30, 2010

Knucklehead 

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.

Knucklehead by Headmonger October 9, 2008

knucklehead 

A playful name to call someone, mainly done by the mentally challenged

knucklehead by Anonymous October 14, 2003

knucklehead 

A dickies wearing, cheap flannel shirt wearing, gangbangin Mexican with a shaved head. Almost always act like dicks.

Ah fuck dood... I was cruisin outta school and this big fuckin knucklehead came up to me and was like 'Eh Vato, Gimme your pinche money esse!' So I yelled for la migra, and wouldn'tcha know, the mafacker ran away! Fuckin hate knuckleheads.

knucklehead by Mecosking February 8, 2008

Knucklehead 

The act of shallowly fisting while simultaneously fellating one's partner.

The new guy at the Rainbow Room gives mind-blowing "knucklehead".

Knucklehead by 6fireguys November 16, 2013

knucklehead 

A person who is from Atlantic City, New Jersey and chooses to remain living there.

That's why these knuckleheads down in A.C. are never going to recover from their economic crisis

knucklehead by DreaGrace February 2, 2017