Green’s Dictionary of Slang

Glasgow Rangers n.

also Glasgows

[rhy. sl.; ult. the football team]

strangers, esp. as used by lookout men working with unlicensed street pitchmen.

1971		J. Jones Rhy. Cockney Sl.
1984		Partridge DSUE (8th edn) 469: since ca. 1920.
1992		R. Puxley Cockney Rabbit.