Green’s Dictionary of Slang

nieve n.

[Sp. nieve, snow, thus snow n.¹ (2)]

(drugs) white powdered drugs, i.e. heroin or cocaine.

1973		J.B. Rosensweig Calo.
1980		‘Gloss. of Drug Terms’ National Instit. Drug Abuse.
2001		ONDCP Street Terms 15: Nieve (Spanish) — Cocaine.