Fit as a Mallee bull
Very fit and strong.
Person 1"How is your dad after the op?"
Person 2"Fit as a Mallee bull. Back on the tractor already."
Where it's from
The Mallee is dry farming country in Victoria and South Australia. A bull that survives out there is a tough one.

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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.