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someone who is dumb, a dumbass, an ass, and tard (aka a retard) all at the same time
"Nate was being such a dumbasstard today!" Ali reported to Carrie.
by Caroline R June 16, 2008
An insult. A combination of "Dumbass", "Bastard", and "'tard"

("'tard" being slang for retard.)
I can't believe he did that. What a dumbass'tard!
by Steven M. Chatterton August 29, 2004