Green’s Dictionary of Slang

skeet n.2

[? scag n.2 (2) + hit n. (3f) or skeet v.1 ]

1. (US prison) a single injection of heroin.

[US]Other Side of the Wall: Prisoner’s Dict. July 🌐 Skeet: A hit of heroin.

2. (US) in pornographic movies, the male orgasm; also as v.

M. Hamid Moth Smoke 93: .
‘deGroot & Rundlet [D.F. Wallace] ‘Neither Adult nor Entertainment’ in Premiere Sept. 93/3: [f.n. 14] Skeet (n/v) is the industry term for both the act of male orgasm (v) and the material thereby emitted (n).