(US, colloquial, simile) Very angry; furious.
My stars! He was mad; mad as a wet hen. He was so mad he looked, as big as he was, to be actually swelled.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.