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Billy Bum; a bum named Billy. Equivalent of a human skid mark. Plural: Bums of Billies
Ratchet ass ho: Ayy yo Billy! Billy Bum! Suck my dick real quicks!
by JTW-CLS-SER May 16, 2016
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a gross guy with a large derrière. most often in the shape of a watermellon
friend: eww look at HIM!
me: yeah i know * gagging noise* total billy bum
by gothkitty November 18, 2008
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