Top Definition
Bruises of unknown origan
ie) After a night out drinking with friends I woke up with several b.u.o's.
by spiceS June 19, 2011

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Break upp-abble offense
She farted in the middle of having sex. That was a total B.U.O.
by dango fett August 25, 2005

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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