Green’s Dictionary of Slang

joy pop v.

[SE joy + pop v.1 (5a)]

(drugs) to inject narcotic drugs irregularly, often just under the skin.

see joy-popping n.
[US]W. Motley Let No Man Write My Epitaph (1960) 171: Fran joy-popped. Just hit with the stuff under the skin.
[US]W. Brown Teen-Age Mafia 6: I like to joy-pop sometimes. [...] I like a little horse now and then to set me up.
[US]C. Cooper Jr Scene (1996) 85: I’m glad I don’t use [...] I’m glad I don’t do nothin but joy pop.
[US]E.E. Landy Underground Dict. (1972).
[US]Tarantino & Avery Pulp Fiction [film script] 58: I don’t go joy-poppin’ with bubble-gummers.
[US]ONDCP Street Terms 13: Joy pop — To inject a drug.