Arvo
Afternoon. Used heaps by basically everyone.
Person 1"Coming to the beach this arvo?"
Person 2"Nah, Sunday arvo's for the footy."
"Knock off early and we'll have a beer this arvo."
You'll also hear
S'arvothis afternoon
Arvo teaafternoon tea, usually with biscuits
Where it's from
Chop the word, stick an -o on the end. Same machine that made servo, ambo and bottle-o.

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While you're here
Petrol station. Also where you buy a pie, milk and a bag of ice at 11pm.
Paramedic, or the ambulance they turned up in.
A bottle shop, where you buy grog to take home.
No. Starting with yeah makes it sound a bit more friendly.
Genuine, true, no word of a lie. Also a question: "Fair dinkum?"
Toilet. Traditionally an outhouse down the back of the yard, now any toilet at all.