Green’s Dictionary of Slang

turkey n.3

[ety. unknown]

1. amphetamine.

[UK]D. Gram Foxes (1980) 40: Sweet things. Like [...] Black Mollys and even some Wild Turkey.
[US]ONDCP Street Terms 22: Turkey — Cocaine; amphetamine.

2. (drugs) cocaine.

[US]ONDCP Street Terms 22: Turkey — Cocaine; amphetamine.