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Someone who's numb in the brain, closely related to the term "dumbass".
Jennifer: I can't find my keys!
Ella: they're in your hand, numbass.
by Eeboo April 04, 2015
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A term used when describing someone who just had anal sex.
Tyler: 'Have you seen Shane today?
Andrew: 'No I haven't. I heard he had anal with Cullan last night.'
Tyler: 'Wow, he's such a numbass.'
by MissMakayla(: May 30, 2010
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