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barmy as a bandicoot
you are as crazy as a small furred Australian marsupial: You're as barmy as a bandicoot, mate.
Editor's comments: Is this phrase still in current use?
Contributor's comments: In answer to you contributor's comments: I actually sent you this regionalism and I know a lot of people that use it. Thanks for putting it on your site!!!
Contributor's comments: Crazy / mad / mentally unstable: "You're as barmy as a bandicoot, mate."