Green’s Dictionary of Slang

biz n.2

also bizz
[abbr. business n. (9a)]

1. (drugs) the kit (eye-dropper, needle, spoon etc) used by a narcotic addict for injections.

[US]D. Maurer ‘Lang. of the Und. Narcotic Addict’ Pt 2 in Lang. Und. (1981) 99/2: The biz, bizz, or business. 1. An outfit for taking drugs hypodermically; it consists of a hypodermic needle or some homemade substitute, a medicine-dropper, a cooking-spoon, and a piece of cotton for filtering purposes.
[US]Monteleone Criminal Sl. (rev. edn).
[US]Anslinger & Tompkins Traffic In Narcotics 303: biz. The business: the hypodermic needle used by the addict.
[US]J.E. Schmidt Narcotics Lingo and Lore.
[US]E.E. Landy Underground Dict. (1972).
[US]Bentley & Corbett Prison Sl. 80: Biz The paraphernalia a drug user utilizes to inject heroin and other drugs. A person’s ‘biz’ usually consists of a hypodermic needle and syringe, a spoon, a tie-off or tourniquet, cotton and matches.

2. a bag or portion of drugs.

[US]D. Maurer ‘Lang. of the Und. Narcotic Addict’ Pt 2 in Lang. Und. (1981) 99/2: The biz, bizz, or business. 3. Narcotics.
[US]E.E. Landy Underground Dict. (1972).
[US]ONDCP Street Terms 3: Biz — Bag or portion of drugs.

In phrases