dry as a dead dingo's donger

adjective2

1. •
   (slang, vulgar) Very dry, extremely dry.

   • ‘Not on a Sunday, mate. Town's as dry as a dead dingo′s donger. This is Queensland,’ explained one of the station hands. — 2008
2. •
   (slang, vulgar) Very thirsty.

   • ‘No worries,’ Frank said, paying for his drink. ‘Boy, I need this. I′m drier than a dead dingo′s donger.’ — 2001