Top Definition
short for "why you bitchin out?" and used as a nickname for people who

1: always bail on you
2: flake after promising/agreeing to something
John: Lets go to the gym later!
Mike: yeah, sounds like a good idea
-- later --
Mike: I can't go cause I'm really sleepy
John: YUBOOOOOOO
by YOYEEEEE February 01, 2014
1 more definition
The Destroyer Of Worlds!
Look out for Yubo!
by K2vers February 04, 2010

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