Green’s Dictionary of Slang

(Aus.) the outback.

1981		Guardian Weekly 22 Mar. 🌐 We fly over hundreds of miles of bush, scrubby gumtrees, dry paddocks, and salt flats. ‘That’s it, mate,’ says [the pilot]. ‘GABA – Great Australian Bugger All.’.
1991		S. Winchester Pacific 376: What locals call the Gaba – the Great Australian Bugger-All.