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1.
Noun. A bongobum is a backside which has relative features to a bongo drum. For example, the buttocks can have a likeliness sound when played as an instrument, a visual likeliness and a likeliness feeling to a bongo drum.
Plural- bongobums.
Boy: Woah! When I hit that girls booty it sounded like bongos!

Boy's friend: Yeh! That girl has such a bongobum!
by Dancergirly000 November 15, 2011
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