piss up verb 2piss-up noun 1forms 5 verb2 •(informal, vulgar) to screw up, make a mess of •(informal, vulgar) to blunder, to make a mistake piss-up noun1 •(slang, vulgar) A party where people consume alcohol.. . . passed: all bullshitted up for the pictures or a piss-up in the town. — 1950 formspissed up · pissing up · pisses up · piss ups · piss-ups
