Buckley's chance
No chance at all.
Person 1"Reckon we'll get tickets?"
Person 2"Buckley's."
You'll also hear
Buckley's and nonelonger version
Where it's from
Often linked to William Buckley, an escaped convict who lived with the Wathaurong people for 32 years. The link is not proven.

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.