(as) dry as a Pommy's (bath) towel

slang Extremely thirsty. "Pommy" (sometimes spelled "Pommie") is a potentially offensive Australian term for a British person, and this expression mocks their perceived subpar bathing habits. Primarily heard in Australia. Can I get some water, mate? I'm dry as a Pommy's bath towel. We were as dry as a Pommie's towel after working out in the sun all day, so we all went to the pub for a pint.