Brass razoo
A coin that never existed. Not having a brass razoo means being completely broke.
Person 1"Lend us twenty?"
Person 2"Haven't got a brass razoo till payday."
You'll also hear
Not worth a brass razooworthless
Where it's from
First recorded among Australian soldiers in World War I.

Something wrong or missing? Suggest a fix
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.
Toilet. Traditionally an outhouse down the back of the yard, now any toilet at all.
Used to explain something that's chaotic or a complete mess.