Mad as a cut snake

simile

Furious, or completely crazy.

Person 1"Did you tell Kev about the ute?"
Person 2"Yep. He's mad as a cut snake."

You'll also hear

Cross as a frog in a sockangry
Mad as a hatterBritish version

Where it's from

A snake cut in half keeps writhing and striking.

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While you're here