piss-up

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piss up

slang A party, event, or other function at which a lot of alcohol is consumed. Primarily heard in UK. I was sick all weekend after going to that piss up on Friday night.
See also: piss, up

piss-up

A social gathering at which people drink an excessive amount of alcohol. Bob didn't go to the party because he knew it was going to be nothing but a piss-up.
References in periodicals archive ?
Sadly, I am too busy to attend, but I am reliably informed this jamboree takes place on the Tuesday and Wednesday, and those who take it seriously go straight on from Lunchestown to pick up where they left off at the post-race piss-ups at the Irish Derby meeting.