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It means very drunk. I think it came from a medieval torture method,where a rat was placed on the victim's stomach and a bucket placed on top of it. The bucket was then heated and the rat would burrow into the victim's stomach trying to escape. It would eventually come out of the victim's backside.The victim would be dead (from bleeding) by this stage. So being truly "rat-arsed" is not a good thing.

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11y ago

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