"brushing shoulders off". Used when a person wants to express how baller or proud he/she is
Guy 1: Hey did you hook up with those two girls last night?
Guy 2: Yea bro I'm such a pimp. BSO
by JMayzin July 13, 2010
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a group of silly people, without a future. They hang around downtown all day, smoking and shouting all over the place.

-Hey, look at those nigga's over there, aren't they supposed to be at school?
-I think so. They're problably bso's.
-Yeah.
by arrogant zakje January 29, 2008
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