Top Definition
It's a poor person (bum), that takes (scabs) the last bit off the cigarette (butt) with a tiny bit of tobacco left in it that people usually drop on the ground once they are done with it.
''Ah man, got to work for the rest of the week and i'm broke as hell, i might have to be a butt bum for the week''
by adam096 December 21, 2009

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