One who behaves in an irrational or immature manner
Don't be such a doofus!!!
by Splenda June 21, 2001
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goofy, used in a teasing manner.
Hey doofus! Stop being silly and get over here!
by Neurotic Newman March 12, 2009
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Democrats Obeying Obama For Universal Socialism (DOOFUS)
Support Prez. Obama! Be a DOOFUS!
by Boatrocker March 26, 2010
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Someone without a clue as to what is going on and/or generally has bad reflexes.

May occasionally do something stupid by accident (tripping, falling, etc.)
That doofus over there just walked into a stop sign!
by HiPeople March 22, 2010
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The pinnacle of being a blonde; a girl with no clue; oftentimes nieve (though sometimes in an endearing way); a person who likes bad basketball teams, any girl named Katie.
That girl just dyed her hair blonde, as if we didn't already know she's a doofus.

She just picked UNC to win at basketball, she must be a doofus.

Yep, her name's Katie...she must be a doofus.
by theman85004 January 8, 2007
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