Green’s Dictionary of Slang

(Aus.) a generic term for an Indian.

1903		West Australian (Perth) 30 Dec. 6/7: Gunga Brahm, the Indian wrestler, and Jack Perryman contested a match.
1914		Bulletin (Sydney) 20 Aug. 14/3: They were dirty, also; but that was a secondary consideration. They started fighting, and one turbaned shirt-tail nearly slew another. [...] The Law then stepped in, and Gunga and his compatriots were fired home to Delhi’s coral strand.
1916		Barrier Miner (BBroken hill, NSW) 7 Feb. 3/5: Gunga Brahm, formerly a well-known wrestler [...] died at Kooroit (Vic.) about a week ago.