Hotter than a two-bob pistol
Extremely hot.
Person 1"How was Birdsville?"
Person 2"Hotter than a two-bob pistol."
You'll also hear
Hotter than a two-dollar pistolsame meaning
Where it's from
A cheap pistol heats up fast when fired.

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While you're here
Extremely busy. Can be sarcastic about someone who isn't busy at all.
Extremely thirsty. Also used for weather that has not seen rain in months.
Completely full, usually after a big feed. Sometimes used for very drunk.
Showing off and very pleased with yourself.
Almost impossible to find.
Extremely happy.