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

"I hear that Johnny shot himself in the head while cleaning out a loaded shotgun before he headed out for the opening of dear season, what a numbnut!"
by btezra October 25, 2002

by Italian Stallion November 17, 2004

This word is Self-Explanatory
by Stu August 13, 2004

by Jockular Strapping June 7, 2005

by Red December 13, 2003

by maximorph April 23, 2003
