Green’s Dictionary of Slang

1. (drugs) heroin [the perceived ‘masculinity’ of the drug; cf. boy n.² (5a)].

1969		R.R. Lingeman Drugs from A to Z (1970).
1971		E.E. Landy Underground Dict. (1972).
2001		ONDCP Street Terms 12: Him — Heroin.

2. see he n.