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A simple fusion of Scum and Believable. Used to describe (traditionally female) people who are deemed to behave or present themselves in a manner which is considered slutty.
a) My god, what IS she wearing?
Looks pretty scumbelievable to me.

b) Did you hear about last night?
Yeah i know, that one is pretty scumbelievable if you ask me.
by Tabby123 November 10, 2007
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