Green’s Dictionary of Slang

(orig. US black) a black male teenager, focused on rap music and the ghetto street lifestyle; thus the female B-girl, B-boyette; generic B people; as v., to live as a B-boy.

1981		Village Voice (N.Y.) 2–8 Apr. 31: The heroes of these legends are the [...] B Boys, the Puerto Rican and black teenagers who invent and endlessly elaborate this exquisite, heady blend of dancing, acrobatics, and martial spectacle.
1982		Break Machine ‘Break Dance Party’ 🎵 You see we’re going to the top / Because us B-Boys never stop.
1987		D. Hebdige Cut ’n’ Mix 140: Crews of break-dancers (called B-boys and B-girls) had developed acrobatic dance routines.
1992		(ref. to 1975) N. George ‘Chronicle of Post-Soul Black Culture’ in Buppies, B-Boys, Baps and Bohos (1994) 12: 1975 DJ Kool Herc hosts shows at Hevalo [...] where he specializes in the short ‘break’ sections of records. The dancers who follow him will come to be called ‘B-boys’ or ‘break boys.’.
1994		Source Oct. 30: The first time that I seen someone scratch a record was 1975 at a block party. Ever since then I’ve been B-boying.
2000		Hip-Hop Connection Jan. 73: The tiny elevator is crammed to the limit as it ferries hundreds of fresh-faced b-people to the action. [Ibid.] 74: More than likely you’ll be inviting your spotty bunch of b-boyettes around for a shandy.
2000		W. Shaw Westsiders 49: Shut out of the clubs, the new ‘b-boys’ — the ‘Bronx boys’ — who made up Herc’s fans embraced the beat-down sneakers that kept them off the glitterballed disco floors.
2008		(con. mid-1970s) ‘Grandmaster Flash’ Adventures 37: ‘What the hell was that?’ [...] ‘I just broke on you,’ he said, cool as a cucumber. ‘And you can call me a b-boy’ [...] Popping, locking, b-boying, and baby-rocking.
2008		‘Grandmaster Flash’ Adventures 39: Herman Kelly. Kool and the Gang. Seventh Wonder. Those guys were challenging break-boys to show what they were made of.
2010		Codella and Bennett Alphaville (2011) 62: I flashed a disdainful look at my Colombian B-boy drug connection.
2017		Honolulu Star-Advertisier (HI) 7 July T20/2: Skillz Talk 2017: The Hawaii hip-hop dance event returns with b-boy and all-styles competition.