Green’s Dictionary of Slang

(drugs) phencyclidine.

1977		L. Young et al. Recreational Drugs.
1979		H. Feldman et al. Angel Dust 124: The large number of street names it has been accorded over the years: [...] skuffle.
1984		Abel Dict. Drug Abuse Terms.
2001		ONDCP Street Terms 19: Scuffle [...] Skuffle — PCP.