Green’s Dictionary of Slang

(drugs) phencyclidine.

1977		cited in Spears Sl. and Jargon of Drugs and Drink (1986).
1980		‘Gloss. of Drug Terms’ National Instit. Drug Abuse n.p.: Cycline – PCP.
1981		D.E. Miller Bk of Jargon 337: cyclones: PCP.
1996		R. Rendell Keys to the Street 129: A couple of Es? Some cycles?
2001		ONDCP Street Terms 7: Cycline — PCP. [...] Cyclones — PCP.