b is short for bag, the verb. bag is used to mean that someone is going to hook up with someone else. so when someone is trying to bag someone else, as in they are flirting or starting to make moves, one would make his/her right hand into a b (thumb straight up, fingers curled behind curled pointer finger) behind the person who is trying to bag. in addition, someone could say "b" or type it on facebook, text it, etc.
Example 1: Jack goes over to Anna and says, "Nice shirt," in a flirty way.
Aaron goes behind Jack and puts up a b with his hand.
People laugh

Example 2: On facebook, Jamie writes "wish i could've seen you today :(" on Ryan's wall.
Adrian comments on the wallpost saying "b"
by an0nnn111 June 19, 2011
A substitute for bitch and bastard that maintains your politesse.
"That project was such a B"
"So was our project manager!"
by ::the.queen.bee:: February 04, 2010
The slang term for a person that has B at the beginning of his/her name, normally "his", is seen very common with the "brian" name.
Guy 1: Yo B! What is up my man?

B: Nothing much man!
Guy 1: Man that is hott...
by Dr. Cik March 31, 2010
Heroin - derived from brown, which is the colour of heroin. DUH!
Cat: got any b in man, i need a hit.

Dealer: yeh yeh, come round.
by fucked-up-from-day May 09, 2009
Term used in NYC metropolitan era in the 70's but became mainstream in the 80's At first used mostly by breakdancers and then other hip hop artists, and then drug dealers and people in general B is short for bboy or break boy
Wha'ts up B

B boy, b girl
by alvanson September 20, 2008
another word for spliff mainly used in midlands in the uk
wanna roll a B? , pass the B
by A star P January 17, 2007
used as a replacement for "blaze". meaning to go smoke bud.
Me: Sup dog, you wanna b?

Homie: yeah fewl! im so down!
by Tha Madd Hatter March 12, 2010
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