the b in b-boy stands for Break, in the 70's when there was a 'break' in a song (which is when there is no vocalisation and just the rhythem) that was when the dancers would get down and do thier thing, the boys that danced on the 'break' were called b-boy same for the girls 'b-girl'

b-boy
n. (bee-boi)

In contrast to popular belief, the TRUE definition of a b-boy is not simply just a male breakdancer. The main difference between a breakdancer and a b-boy is that a breakdancer is one who uses the hip-hop art form known as breakdancing to get chicks and/or to show off to his friends that do not know shit about breakdancing or perhaps anything about hip-hop in general; in contrast, a b-boy is one who expresses himself through breakbeats (beats that b-boys can break to) using various combinations or sets of breakdance moves such as:
-toprock
-uprock
-downrock (e.g. 6 step)
-freezes (e.g. single hand baby-freeze)
-power (e.g. flares)
-airtracks (e.g. UFO)

A true b-boy will add his own style to these various sets. These sets are innovated by b-boys through rigorous dedication and practice during "session" or breakdance practice. Any set that is “taken” or “copied” from one b-boy by watching another b-boy/b-girl is called a “biter”.

A real b-boy will break anytime, anywhere, and any day, when challenged or "called out" by another dancer or b-boy/b-girl in a "battle". In many cases, a b-boy will encounter a dancer or another "b-boy/b-girl" that is "straight up whack" or simply disrespectful, in which case a b-boy will wish to "serve his/her ass". But in many cases, a battle between a b-boy and another dancer or b-boy/b-girl, will have both sides showin' much peace, love, respect and even props.

Simply put, a b-boy is one who encompasses the...

break-girl, the female version of b-boy. aka. a female breaker (a 'break-dancer' WITH style)

B.52-1 Code is the name given to a completely random fact that no one should really know, so when it's said to you, you react with an immediate WHAT THE FUCK and a back hand to the face.

The copyrighted name B-Lo refers to the city of Buffalo and is used by SellMOST Industries founder and western New York rap artist B-Lo.

Characteristic of or pertaining to the Ghetto, where "Ghetto" is used in a derogatory sense. An alternate form is "b'getto".

The act of requesting the support of /b/rothas to help accomplish an objective. Usually when a mass amount of /b/rothas acquire /b/lackup, they are an unstoppable force.