Green’s Dictionary of Slang

1. cocaine.

1985		T.R. Houser Central Sl. 14: caine [...] The boy got that ride from sellin’ the caine.
1989		(con. 1982–6) T. Williams Cocaine Kids (1990) 106: He’s got a scale on the table, with some cut foil, some ’caine, and a bag full of money.
1997		(con. 1970s) G. Pelecanos King Suckerman (1998) 32: You could hook him up with a sweet deal on a few keys of ’caine.
2001		ONDCP Street Terms 5: Caine — Cocaine.

2. crack cocaine.

1987		Ice-T ‘Six in the Morning’ 🎵 Was my homeboy Red — some say he’s insane / Broke his bitch jaw for smokin’ caine.
1995		Mack 10 ‘Based on a True Story‘ 🎵 Thats the way it go, thats the name of the game / Young niggas gettin over by slangin caine.
2001		ONDCP Street Terms 5: Caine — [...] Crack Cocaine.
2004		T.I. ‘Be Easy’ 🎵 Rhyme about the times I invested in ’caine.