(UK, Irish, Commonwealth, colloquial, mildly, _, vulgar) Extremely drunk.
I got completely rat-arsed last night, and ended up tied naked to a lamp post. I'm not going to do that again.
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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.