piss-up
(redirected from a piss up)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.
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.