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1.
being stupid for no good reason; as opposed to being retarded, which is a mental condition
Gigli was fucking dumbtarded.
by Rich November 17, 2003
 
2.
1. adj. A combination of being dumb and retarded.
2. adj. Being either extremely dumb or retarded.
3. adj. Lacking so much intelligence that you cannot possibly describe your dumbosity or retardedness with one word.
Andy from Toy Story was dumbtarded for writing the N on his name on Woody's foot backwards.
by Ian Spik March 17, 2006
 
3.
When a person is coincidentally both dumb, and retarded at the same time, hence.. dumbtarded.
Dude, i swear you are gaymosexual.

Well, at least im not dumbtarded.
by Ryanmh3 August 21, 2009