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1.
Reminiscent of the hunched over cave man, with his arms to the ground. An insult used against those of extremely low intelligence, or general stupidity.

Also see low brow
Bubba is such a knuckle dragger.
por Matt 29 de Setembro de 2004
 
2.
A really dumb redneck, country bumpkin
Larry The Cable Guy ain't nothin' but a knuckledragger
por cartoonmayhem 22 de Agosto de 2006
 
3.
A malicious term used to describe a person of African American descent. The term is used to compare African-Americans to apes, since apes are known to walk using their knuckles.
All them knuckledraggers are the same, stupid as shit and using foodstamps.
por Mr. James Jonathon Peterson 27 de Junho de 2009
 
4.
Someone who's intelligence is less than or equal to that of your average caveman.
Wow, he really thought spending 803 Billion dollars we don't have was the way to fix the economy. What a knuckledragger!
por NO_Iwon'tpress1forEnglish 01 de Setembro de 2010
 
5.
Military slang referring to infantry or Special Forces personnel, or paramilitary components of the US Intelligence Community.

The term stems from the common belief among the rear echelon and support personnel that Infantry soldiers are of generally lesser intelligence than support personnel.
The Liberty chow hall was full of knuckle draggers today, they smelled like B.O. and gun powder.

I had to catch a ride to the Green Zone with a platoon of knuckle draggers, and they made fun of my M16 A2 the entire time.
por cdangerd 10 de Dezembro de 2009
 
6.
An individual, usually male, who lacks intelligence and/or culture.
The knuckle-dragger could not even name when the War of 1812 was.
por Tristan Reef 22 de Outubro de 2007
 
7.
Friendly jibe for a Snowboarder. Often given to snowboarder by a skier buddy.
Skier to Snowboarder: Hey knuckledragger , quit scrapin the snow off the trail.
Snowboarder to Skier: Outta my way 2-planker, snowboarders pwn this mountain.
por 07079 14 de Janeiro de 2009