Top definition
A guy (person, as a non-sexist term) who has a suspiciously quiet rear end. Can also be used as an insult, or general slang term for rear end.
Do you have a dumbutt? (as a question)
What a dumbutt! (as an insult)
Man, my dumbutt is killing me! (as a slang)
by Define The Dumbutt April 20, 2006
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2
An idiot, a butthole, or a stupid person who always messes up.
What a dumbutt!
by xXx_The Memester420_xXx February 22, 2017
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