A person who usually shows some sign of intelligence (not completely necessary though), but has brief lapses where they act completely retarded and senseless.
Willie: My mother said it's the law that I need to have my permit for another year before I can get my license...
Dan: Willie, did you notice all of us only had our permits for six months? We're two years younger than you and have our licenses already.
Willie: Durrr, I didn't really think about it... *proceeds to stare off into the distance with a blank look while making indistinguishable noises*
Dan: Frickin' dumbohead...
Dan: Willie, did you notice all of us only had our permits for six months? We're two years younger than you and have our licenses already.
Willie: Durrr, I didn't really think about it... *proceeds to stare off into the distance with a blank look while making indistinguishable noises*
Dan: Frickin' dumbohead...
by D Pat September 12, 2007
Get the dumboheadmug.