Sparrow's fart
Very early in the morning, around first light.
Person 1"What time are we heading off for the fishing trip?"
Person 2"Sparrow's fart. Be ready by five."
"Had to get up at sparrow's fart to beat the traffic."
You'll also hear
Sparrow'sshort version: "up at sparrow's"
Where it's from
Sparrows are among the first birds up and chirping at dawn.

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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.
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.