Green’s Dictionary of Slang

1. a general thief, with no real speciality.

1950, 1955

‘No. 35’ Argot in G. Simes DAUS (1993).

2. a man who lives on money taken from a procurer.

1967		‘Whisper All Aussie Dict.’ in Kings Cross Whisper (Sydney) xxxv 6/3: kway: A person of the male gender who lives on the money taken from a hoon.
1977		J. Ramsay Cop It Sweet 53: kway: Male who lives off a hoon’s money.

3. (UK Black) somewhere beyond one’s own area, thus kway out, far away.

2015		67 ‘Low But Bait’ 🎵 Long trips for the bands got me miles away / More times I be kway out.
2017		1011 ‘No Hook’ 🎵 Man bring that gyal from kway to suck off all of my friends.
2021		Central Cee ‘Tension’ 🎵 Bando, kway, no reception.