Green’s Dictionary of Slang

an Australian.

1917		Weekly News (Yaraville, Vic.) 3 Nov. 2/7: Fritz gets his wind up and starts running / When he hears that the Ozzies are coming [...] Note: Ozzies is evidently a nick name for Australians.
1919		Register (Adelaide) 17 May 4/5: A feature of direct interest in Australian fighting men is a fervent poem ‘From An Ozzie’.
1935		Central Qld Herald 22 Aug. 45/2: [healine] A Marxian Among the ‘Ozzies’.
1994		J. O’Connor Secret World of the Irish Male (1995) 202: One of the Ozzies says I should dye it green.
1996		Penguin Bk of More Aus. Jokes 346: U’ve gotter git some ilocution lissons so these blddy Ozzies wull live me ulone.