B.O.S stands for Beat off session. A B.O.S is time set aside for a male to masturbate.
- Karl can I call you back?

- Why man?

- Im gonna go have a B.O.S

or

- Hey Raquel, you mind giving me a hand with my B.O.S?

- Sure, anytime
by TheJordanman November 08, 2006
Bo
Short for elbow
esp. in fighting
See also bolo
Them cats is beefin' dog, they's abouts to throw some bo's!
by Cosmic Truckaz October 16, 2003
It means when you're going for a ( Wank, Masurbate, etc )
B. = Burst
O. = Of
S. = Speed
Me> Hey fred, I'll brb.
Fred> kk, why?
Me> Going for a B.O.S.
Fred> Kk, safe!

B O S B.O.S BOS Wank Masturbate
Bo
jamon motha fucka
jamon motha fucka
by JCDenton December 11, 2003
bo
having a little sleep in the day
im having a bo (zzzzzzzzzzz)
by marshmallowsex March 04, 2004
bo
A tranny-slut, with 3 penis's and vagina queefs!
u are such a bo you cunt fucker bo head.
by Alexandra April 02, 2005
Bo
Bo is a cat from the land of oz where Carrie fisher and tanya ducksworth lives
That Bo trampled on my flowers

OH BO U TWAT GO EAT SICK!
by Nidzxxx July 06, 2004

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