Green’s Dictionary of Slang

1. (US black) Burger King.

2000		Cybersight (Lincoln Ill.) 🌐 Mcdonald’s RULE BIGTIME. They are plump favorful and just right salty. Never dried out like BK’s. Never stale like Arby’s.
2002		BK Therapy Center 🌐 I don’t care if you got a whopper cheaper at another B.K. this restaurant is a Franchise owned restaurant and our prices aren’t the same.

2. (US) in pl., British Knights, a brand of trainer.

1992		R. Price Clockers 91: The convict pointed at the BKs and then tapped his own chest.
2002		Vigil & Moore Rainbow of Gangs 58: He started dressing even more in the cholo style: khakis, cutoffs, white T-shirts, and athletic shoes — BK’s.

3. (US prison) ‘Blood Killer’: used by the Crips gang to threaten their rival Bloods.

1998

Mayor’s Anti-Gang Office City of Houston, TX Street Gang Sl. / Gloss. 9 Nov. n.p.: bk Initials meaning Blood killer; used by Crip gangs to threaten rival ‘Blood’ gangs; the brand of athletic shoes called British Knights are popular with the Crip gang members because of the initials on the shoes ‘BK.’.

4. (US black) Brooklyn, N.Y.

1994		Notorious B.I.G. ‘Unbelievable’ 🎵 Representin’ BK to the fullest.
2002		Talib Kweli ‘Shock Body’ 🎵 BK, BX, Q-Boro, like what you gonna do when we come through.
2012		‘Dutch’ ? (Pronounced Que) [ebook] Stick them nigguhs hollerin’ Brooklyn! Shit, them nigguhs still probably think it was BK [...] We gonna hit the uptown spots hollerin’ BK and hit the BK spots hollerin’ Uptown.