Green’s Dictionary of Slang

1. 1oz (28g) of cannabis.

1986		R.A. Spears Sl. and Jargon of Drugs and Drink.
2020		G. Krauze What They Was 213: I stuff the zeds we’ve already got into the pockets of my Avirex.

2. 1oz (28g) of heroin or crack cocaine.

1975		Wentworth & Flexner DAS.
1981		H. Gould Fort Apache, The Bronx 267: You got nine ounces out of that little old zee I sold you.
2001		ONDCP Street Terms 23: Z — 1 ounce of heroin.
2015		J. Spades ‘Flexin’’ 🎵 Sell bricks or you sell zizz then the pagans them / A go tell feds.
2015		67 ‘Dead Up’ 🎵 Walk around with 5 zeds in my pouch.
2016		Barer et al. Betrayal in Blue 142: Elvis [...] gave him an ounce while we were out on patrol. Mike called it a ‘Z’—short for ounce.
2017		1011 ‘No Hook’ 🎵 I just put 4 z’s in pebs, plus I get bits for man if they need it.