Green’s Dictionary of Slang

(Aus.) a schooner of beer.

1978		R. Cass High Jinks Down Under 61: ‘Give the bludger here a schooey, mate,’ he said.
1998		Google Groups: aus.music 21 Dec. 🌐 And you can still hear and see everything while you’re buyin a schooie.
2001		Google Groups: alt.homebrewing 9 Apr. 🌐 In NSW a schooey is definitely 425ml.
2017		(un)Australian 11 May 🌐 Barnaby Joyce’s Speechwriter Admits He Can’t Work Without A Puff Of Whacky Backy And Six Schooies.