Green’s Dictionary of Slang

(drugs) phencyclidine.

1969		R.R. Lingeman Drugs from A to Z (1970).
1978		L. Kramer Faggots 301: You name it, somebody’s on it. MDA, MDM, THC, PCP.
1990		S. Morgan Homeboy 126: He produced Methedrine, LSD, PCP and crack for the Joe Sing gang.
2001		ONDCP Street Terms 16: PCPA — PCP.
2005		E. White My Lives 280: Hopped up on blackbirds, yellow jackets, PCP and joints sprayed with angel dust.