Green’s Dictionary of Slang

(Aus.) South Australia.

1907		Sun. Times (Perth) 10 Mar 7/1: It seems strange that Glance [...] should get a telegram from Broken Hill to say that no men are wanted there, when the press of South Oss say there is a shortage at Broken Hill of 2000 to 2500 hands.
1927		Age (Melbourne) 19 Nov. 29/3: [T]hat bloke Andrew Cobham was the one to show ‘em how to fly, him and Sir Keith Ross of South Oz .
1930		Advertiser (Adelaide) 29 Nov. 11/1: Lo. I set forth the chronicles of Oz in general and of South Oz in particular. A land of breeze and sunshine, glorious, great, and grand, but fallen for a while on evil days.