What’s an underappreciated Australian word or phrase that most non Aussies wouldn’t know?

We all know about 'G'day' and ‘not here to fuck spiders,' but what are some lesser-known Aussie words or phrases that you use regularly, but outsiders might not know? Whether it’s regional slang, or something you grew up hearing in your family, I'd love to learn about these hidden gems of Aussie lingo