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?
by Megaloman March 12, 2009

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The phenomenon that occurs when a male places a cold drink between his legs and leaves it there for a prolonged period of time. Upon standing or moving, the chilled testicles brush or rest against the leg, causing an unexpected chill to temporarily overcome the victim. Most susceptible, are wearers of boxer-style underwear.
I set my beer between my legs for a majority of the movie. When I stood up, I got numb nuts.
by drgn76 October 11, 2010

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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?!"
by pedicabber April 22, 2005

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Frozen Testicles
Ugh, I HATE it when I have numb nuts!
via giphy
by jiffyjoff June 24, 2017

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A light word for calling someone a fucktard.
Person 1: "Bill is a numb nuts"
Person 2: "why"
Person 1: "because he for got his phone at the pub"
by Death_ray_dan May 09, 2014

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A numbnuts is a person of 'a certain age', i.e., old enough to know better, who behaves like a total shit or shithead. A jerk, a fool, a putz, schmuck, asshole, etc.
Mike and Louise behaved like complete numbnuts over that issue. They got mad and over-reacted, just like the numbnuts that they are.
by Athelstan Spilhaus IV September 10, 2006

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A fucking moron. See fucktard.

Came to prominence after Austin Powers (I forget which one).
A trillion is more than a billion, numbnuts.
by The Beer Baron October 07, 2004

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