Definition of bb:
(n) :
A type of pellet that can be shot from a BB gun.
(n) :
(baseball) A walk; the statistic reporting the number of "bases on balls".
(n) :
Initialism of basketball. [(sports, uncountable) A sport in which two opposing teams of five players strive to put a ball through a hoop.]
(n) :
Initialism of baseball. [A sport common in North America, the Caribbean, and East Asia, in which the objective is to strike a ball so that one of a nine-person team can run counter-clockwise among four bases, resulting in the scoring of a run. The team with the most runs after termination of play, usually nine innings, wins.]
(n) :
Initialism of BlackBerry. [A wireless handheld device, a cross between a cellphone and a mobile email appliance and Internet-capable PDA, marketed by BlackBerry Limited.]
(n) :
(electronics) Initialism of baseband. [(telecommunications) The frequency range occupied by a message signal prior to modulation.]