Green’s Dictionary of Slang

1. heroin; morphine.

1949		Monteleone Criminal Sl. (rev. edn) 23: birdie power [sic] Morphine; cocaine; heroin.
1953		Anslinger & Tompkins Traffic In Narcotics 303: birdie powder. Morphine, [...] heroin.
1959		J.E. Schmidt Narcotics Lingo and Lore.
1971		E.E. Landy Underground Dict. (1972).
2001		ONDCP Street Terms 3: Birdie powder — [...] heroin.

2. cocaine.

1949		see sense 1.
1953		Anslinger & Tompkins Traffic In Narcotics 303: birdie powder. [...] cocaine.
1959		J.E. Schmidt Narcotics Lingo and Lore.
2001		ONDCP Street Terms 3: Birdie powder — Cocaine.