Dry as a dead dingo's donga
Extremely thirsty. Also used for weather that has not seen rain in months.
Person 1"Want a beer?"
Person 2"Does a bear... yes. I'm dry as a dead dingo's donga."
You'll also hear
Dry as a dead dingo's dongeranother spelling
Dry as a chipthe polite version
Where it's from
Donga, or donger, is slang for penis.

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While you're here
A bottle shop, where you buy grog to take home.
Extremely busy. Can be sarcastic about someone who isn't busy at all.
Going at something with great enthusiasm. A masturbation joke.
The pokies. Poker machines at the pub or club.
Completely full, usually after a big feed. Sometimes used for very drunk.
Showing off and very pleased with yourself.