(as) dry as a dead dingo's donger

vulgar slang "Donger" is a slang term for the penis. Primarily heard in Australia.

1. Extremely dry or arid. I hope it rains soon. My fields have been dry as a dead dingo's donger lately. Man, it is as dry as a chip out there today—not a bit of humidity in the air.

2. Extremely thirsty. Can I get some water, mate? I'm dry as a dead dingo's donger over here. We were as dry as a dead dingo's donger after working out in the sun all day, so we all went to the pub for a pint.

3. Extremely wearisome or dull. I know many people consider this topic as dry as a dead dingo's donger, but I've always found it fascinating. That lecture on polynomials almost put me to sleep—it was just dry as a dead dingo's donger.