(out) on the piss
rude slang Drinking alcohol in a public setting, as at a bar or similar establishment. Primarily heard in UK, Australia. My friends and I were out on the piss last night, so I hardly remember anything at all. No drinking for me tonight. I've been on the piss all week long and my body is starting to hate me for it! After a hard week at work, I'd rather go home to a long, hot bath than go out on the piss.
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