It's Aussie slang for guys that drink/guzzle tons of beer.
While I'm at it oldskool, where in W.A. are you? I agree with you, I love my state of W.A.

oldskool, no probs, and yes I am, been here just over 5 years now. Grew up in Exmouth but lived in Perth from 89 to 08. Last place was Gidge up in the hills. I haven't actually seen any pinnies here yet, but I hope to meet some friendly owners soon with machines I can play. I haven't seen a real pin since the late 90's. Been a while...
I see you have 10 machines in your collection. Wow, wish I was in Perth right now to come and visit you! You have a High Hand in your collection. Where'd you get that? I used to have one years ago that was a fixer upper. Was in a sad state. Sold it to Rory in Ozzy Park who used to restore pinnies and put a lot of them on site in The Good, The Bad and The Ugly restaurants. Maybe you have my old one after Rory restored it? Who knows? lol. If you ever come across a Card Whiz with red powder coated legs... that one used to be mine. Cheers, Mal