Green’s Dictionary of Slang

quart n.1

[abbr.]

1. (Aus.) a quart pot, used for drinking; thus quart-pot tea, tea made in the open air and in a quart.

[Aus]Bulletin (Sydney) 6 Oct. 32/1: He got ready to ‘boil his quart’ [...] / A shade of feeling o’erspread his face as he descended, pot in hand, to his mid-day retreat.

2. in drug uses.

(a) a quarter of an ounce of cannabis.

[Scot]I. Welsh Trainspotting 232: We hud a quart ay hash oan us an hud tae eat the lot.
[UK]N. Griffiths Grits 447: — Wha is it ya arftah? — Just a quart. — Yeh. Of wha? smoke?

(b) a quarter of a gram or ounce of any given drug.

[UK]N. Griffiths Grits 64: Al see Colm first like, get rid-a quart or so thir like streytafuckinwey.