Adjective
rat arsed (comparative more rat arsed, superlative most rat arsed)
Alternative spelling of rat-arsed
rat-arsed (comparative more rat-arsed, superlative most rat-arsed)
(Britain, 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.
rat arsed