Top Definition
when a boy has made a false comments you respond sayin "boy boo"
josh : i had sex with tasha

Tasha: boy boo!
by Xxx:: BAdd ::xxX April 28, 2010
1 more definition
A "bromance" that has taken it one step too far. AKA you're boyfriend's boyfriend.
I think I'm going to hang out with my boy boo instead of my girlfriend, it sounds like fun.
by Canbre April 20, 2009

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