Green’s Dictionary of Slang

(Aus.) South Australia; thus n. + adj. Soustralian.

1900		Truth (Sydney) 28 Jan. 1/4: Patriotic Soustralians who sent away a cargo of flour to Kruger and Co.
1904		Sun. Times (Perth) 7 Feb. 8/2: I note that there are 900 ‘looneys’ in the Soustralian Lunatic Asylum. Seems to be mere dilly people in that part than any other State of the Commonwealth.
1907		N&Q 327/1: If it is, why not Eastralia for New South Wales? Why not also Soustralia and Norstralia?
1908		Mining Jrnl 83 231: We note a ‘Soustralian’ report that the borehole on the Burra Burra copper mine [...] has encountered a rich body of sulphide ore.
1910		Sun. Times (Perth) 27 Mar. 2nd sect. 11/3: A gory go took place [...] recently between a Soustralian coon and a local biffer who had ideas one time of tackling Tommy Burns for the heavyweight championship of the world.
1910		Sun. Times (Perth) 19 June 3rd sect. 17/3: Verran, Sou’stralia’s Cousin Jack Premier, is a rabid tea-totaller.
1964		ref. to 1894) C. Mann (ed.) Stories of Henry Lawson 212: In 1894 a writer asked in the Bulletin: ‘Why not Eastralia, Norstralia, Soustralia, Westralia and Centralia?’.