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This word originated in the U.S, however, it's used in the U.K. as well. Most likely its use was born in the U.S. military, just as expressions like soup sandwich and jeep. Made popular in the movie, "Full Metal Jacket," when Hartman yells at Pyle.
"What is your major malfunction, numbnut?!"
numbnut by pedicabber April 22, 2005
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numbnuts 

A person who lacks some combination of common sense, intelligence, manners, or coolness.
What is your major malfunction numbnuts? Didn't mommy and daddy show you enough attention when you were a child?
numbnuts by Megaloman March 12, 2009
Related Words
MCDONALDS LOVER....mainly a lover of chicken mcnuggets but is truely a fat shit
Brian Novak is such a nugnut that he shits out straight mcnuggets daily.
Nugnut by Boo Fa Unit July 13, 2009

numbnuts 

A fucking moron. See fucktard.

Came to prominence after Austin Powers (I forget which one).
A trillion is more than a billion, numbnuts.
numbnuts by The Beer Baron October 7, 2004
1. A person of severely limited intellectual prowess, or extremely lacking in everyday common sense.

2. A viewer of FOX News, who only listens to a single news source, only communicates with others of his/her own political persuasion, and thinks "Tea Parties" are spontaneous outbursts of patriotism, without realizing they are instead, organized and funded by the richest people and corporations in America, with the intent to steal wealth from everyone. i.e. "Americans for Prosperity. "
1. "What a Numbnut! Can't he open his own mind? He thinks he's being patriotic, when in fact he's undermining the Constitution!"

2. "That Numbnut has no idea who's paying for those pre-made astro-turf signs being unloaded off that bus! What a Teabagger!"
Numbnut by Correct_Guy December 31, 2009
A person who is a bit kookie and whacky or not quite firing on all synapses. Is not meant to be derogatory in nature but as an affectionate observation.

"Has anyone seen my medulla oblongata lying? I can't find it since I put it in the tumble dryer to dry out"
"Nutnut"
nutnut by Tania K October 3, 2005
Synonymous with Knucklehead. Stubborn to a fault or causing self harm. Obstinate in the face of facts. Numb Skull or Butt Head.
"Don't be a numbutt"
numbutt by D. Robinson June 28, 2008