Top Definition
Northwestern University Marching Band Alto Saxophone Section
Did you see NUMBASS's perfect fast entry? Yeah, me neither.
by NUMBASS1991 April 04, 2010
1 more definition
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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