Green’s Dictionary of Slang

(US black) a woman, also as term of address.

1994		G. Smitherman Black Talk.
2003		Eble Campus Sl. Nov. 1: B – disagreeable female [...] Often used between female friends as a term of endearment.
2005		Jade LB Keisha the Sket (2021) 34: ‘do me a favour b [...] take a bath’.
2008		J. Miller Getting Played 50: ‘Probably be sayin, “You ugly,” callin’ em B's [bitches] and stuff, then they’ll laugh’.
2016		67 ‘Money Afi Make’ 🎵 Bad b in my bedroom and you know shes peng as shhh.
2020		G. Krauze What They Was 45: The brer she actually likes tells her it’s cool, b, don’t watch nuttin.