Dunny
Toilet. Traditionally an outhouse down the back of the yard, now any toilet at all.
"Check for redbacks before you sit on the dunny."
You'll also hear
Thunderboxan outdoor dunny
Where it's from
From the British dialect dunnekin, a cesspit or privy.

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While you're here
No. Starting with yeah makes it sound a bit more friendly.
Afternoon. Used heaps by basically everyone.
Genuine, true, no word of a lie. Also a question: "Fair dinkum?"
Petrol station. Also where you buy a pie, milk and a bag of ice at 11pm.
Used to explain something that's chaotic or a complete mess.
Use something as hard and as often as you can, usually a car or a tool.