bb is short for bottom bitch, or a butt buddy (someone you are so close with that its almost gay). This can only be achieved by very close friends.
Hey bb, come over.
by Fatniss Neverlean March 29, 2015
Big Boy, a large male. Can be muscular or simply large.
Wow that BB ate all of the steak at the buffet
by Tdog79 December 13, 2014
Beyond Bitch taking it to the next level
You don't want to piss her off, she's BB.
by godoverdog September 08, 2015
Short for Beyond Birthday, who is a fictional character in Death Note's Another Note: The Los Angeles BB Murder Cases.
"Beyond Birthday, the final B.B."
by adam is seme April 16, 2010