Green’s Dictionary of Slang

(Aus.) lucky; occas. as n., a lucky person, thus un-arsey, unlucky.

1950		‘No 35’ Argot in Simes DAUS.
1960		J. Walker No Sunlight Singing (1966) 23: I was real arsy to pick up a job here.
1968		S. Gore Holy Smoke 30: He’d have to be pretty arsey, wouldn’t he? Seein’ he’s a Jew, and it’s them Philistine bludgers that draw it!
1977		(con. 1941) R. Beilby Gunner 87: Now you just lie back an’ take it easy. Ya got a homer, mate, you arsey bastard.
1978		T. Davies More Aus. Nicknames 25: Arsie Is very lucky at cards.
1983		R. Aven-Bray Ridgey-Didge Oz Jack Lang 17: Arsey Lucky.
1986		C. Bowles G’DAY 76: You arsey bastard. Yer gunna be quids in.
1989		R.G. Barrett Boys from Binjiwunyawunya 156: A dubbo like you would be arsey enough to fluke something like this.
1992		Age (Melbourne) 5 Dec. 169/4: They called him Arsey Clarke or Arsey [...] from the traditionaal Australian sayying ‘You’re an arsey bastard’.
2000		Observer Screen 5 Mar. 9: Grassy knoll? My arsey knoll, more like!
2001		Sydney Morn. Herald 6 Feb. 13/3: Warne was caught, stumped and definitely un-arsey.
2015		N. Cummins Tales of the Honey Badger [ebook] [I]t was yours truly who grabbed the cheese and planted it. Very arsey!