Green’s Dictionary of Slang

(US drugs) cocaine.

1949		Monteleone Criminal Sl. (rev. edn).
1952		Lannoy & Masterson ‘Teen-age Hophead Jargon’ AS XXVII:1 25: COCONUTS, n. Cocaine [LAPD].
1953		Anslinger & Tompkins Traffic In Narcotics 307: coconut. Cocaine.
1969		R.R. Lingeman Drugs from A to Z (1970).
1980		‘Gloss. of Drug Terms’ National Instit. Drug Abuse.
2001		ONDCP Street Terms 6: Coconut — Cocaine.