b-boy

Short definition from Wiktionary

Noun

1. 1
   Alternative letter-case form of B-boy.
2. 2
   A male who performs b-boying or breaking, commonly called breakdance; a breaker.
3. 3
   A male member of the hip-hop subculture.

Verb

1. 1
   Alternative letter-case form of B-boy.
2. 2
   To breakdance.