Green’s Dictionary of Slang

werris (creek) n.

(Aus.) a Greek.

1967		‘Whisper All Aussie Dict.’ in Kings Cross Whisper (Sydney) xliii 11/2: werris creeks: Greeks.
1985		R.G. Barrett You Wouldn’t Be Dead for Quids (1989) 101: I’ll introduce you to my neighbour. He’s a Werris, but he’s not a bad bloke.
1999		G. Seal Lingo 90: Some other examples: [...] tennant creek means a Greek (Northern Territory); werris creek (Victoria and New South Wales) also a Greek, usually just werris.
2002		Pete’s Aussie Sl. Home Page 🌐 Werris Creek, Werris: a Greek.