Green’s Dictionary of Slang

1. heroin.

1999

D. Looser ‘Boob Jargon’ in NZEJ 13 32: IV n. Heroin.

2. an intravenous drug user, esp. of heroin.

2001

D. Looser Boobslang [U. Canterbury D.Phil. thesis] 93/2: IV n. 1 heroin an intravenous drug user, esp. a heroin user.