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Blast On Site- used in gang grafitti to threaten rival gangs.

Brothers Of the Struggle - meaning any gang member involved in the gang struggle
B.O.S. Lil' Mac, Blast him On Site
B.O.S. by Oscar III March 6, 2008
stands for Beating on sighting
timmy been slipping up give him a B.O.S.
B.O.S. by kingkong420 January 7, 2008
stands for Balls of steel , is used when someone does something that takes a lot of balls. so you you give them their props. is a compliment given to a true badass
dude 1-- " oh man i cant belive she just did that shes crazy!"

dude 2-- "i know man shes got some B.O.S.!"
B.O.S. by yellowseven365dude September 14, 2012
brushes off shoulder or brushing off my shoulder; used when you want a cocky way of saying thank you
jordan: dawg, you are so good at being cool
kim: b.o.s.
b.o.s. by Kimburrlee May 11, 2008
means bad ass but you say it as bos. not b dot o dot s dot.

(also means Beware of Stingray. sorry steve irwin)
that was so B.O.S. fuck i love you
B.O.S. by yoyoyoyoyooy May 21, 2008
When my girlfriend walked out in her new bikini I got a B.O.S.
B.O.S. by Vada Vada July 23, 2020