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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.
by Matt September 29, 2004
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Apr 22 Word of the Day
When you eat dirt for the first time and leave your family to build a shack in the woods
Bro since I got dirtpilled on Tuesday I have made sooo many worm friends and made them soo many little houses to get married in. Me? Lonely? No you’re the lonely one u lawn owning freak
by ecogoth December 30, 2020
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2
An individual, usually male, who lacks intelligence and/or culture.
The knuckle-dragger could not even name when the War of 1812 was.
by Tristan Reef October 22, 2007
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3
"So many violent acts have been committed by these Knuckle Draggers in 2019. They're out of control".
by IBTAL December 27, 2019
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4
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.
by cdangerd December 10, 2009
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5
A strong or stupid person. Like someone on steroids or a caveman that can only grunt to communicate.
Call off your knuckle-draggers. Justin will pay you whatever you want.

Justin is a knuckle dragger. He believes everything on the internet is fact.
by Lagz November 06, 2013
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