Green’s Dictionary of Slang

angel dust n.

(drugs)

1. anything smokeable, e.g. tobacco, marijuana, parsley, mixed with phencyclidine.

[US]R.R. Lingeman Drugs from A to Z (1970).
[US]Rolling Stone 28 June 4/1: Parsley can give a more powerful high on marijuana. The garden herb, says Olas Hendrickson, is the basic ingredient in a new psychedelic substance called ‘Angels’ [sic] Dust’.
[US]H. Feldman et al. Angel Dust 73: Relatively small groups of officionados smoked it either as ‘angel dust’ (PCP-treated parsley) or ‘killer weed’ (PCP-treated marihuana).
[US]Spears Sl. and Jargon of Drugs and Drink (1986).
[US]Codella and Bennett Alphaville (2011) 193: Booze, junk, coke, crack, angel dust, or a cocktail of two or more.

2. a mixture of cocaine, heroin and morphine, which can be smoked or injected.

[US]Maurer & Vogel Narcotics and Narcotic Addiction in Maurer Lang. Und. (1981).

3. finely chopped marijuana.

[US]Maurer & Vogel Narcotics and Narcotic Addiction in Maurer Lang. Und. (1981).
[US] S.N. Pradhan Drug Abuse.

4. (also angel’s dust) phencyclidine.

[US]E.E. Landy Underground Dict. (1972).
[US]L. Kramer Faggots 256: I thank my angel’s dust because it’s the most wonderful wonder in the world it helps me makes me want to flyyyyyyyyyy!
[US]C. White Life and Times of Little Richard 170: They use all types of narcotics. They go from marijuana to angel dust.
[US]T. Williams Crackhouse 151: spacebase cigar with tobacco removed and refilled with angel dust (PCP) and crack-cocaine.
[US]Mack 10 ‘Ghetto Horror Show’ [lyrics] Somebody ease the pain I need a shot of novacaine / Or angel dust smoke circulatin through my brain.
[US]E. White My Lives 280: Hopped up on blackbirds, yellow jackets, PCP and joints sprayed with angel dust.

In compounds

angel dust hero (n.)

(US) a regular user of cocaine.

in K. James Jumping Ship and Other Stories in Major (1994).