Green’s Dictionary of Slang

1. the chin.

1944		Maurer & Baker ‘“Aus.” Rhyming Argot’ in AS XIX:3.
1969		S.T. Kendall Up the Frog 13: I got ’im right on the Gunja Din with me Oliver Twist an’ put ’im to Bo-Peep.
1972		Dodson & Saczek Dict. of Cockney Rhy. Sl.
1981		P. Wright Cockney Dialect and Sl. 105: Gunga Din ‘chin’.
1992		R. Puxley Cockney Rabbit.

2. (Aus.) gin (and water).

1972		Dodson & Saczek Dict. of Cockney Rhy. Sl.
2002		Pete’s Aussie Sl. Home Page 🌐 Gunga Din: gin (drink).