Traditional
Still common
Definition
A heavy drinking session or boozy party.
Example Sentence
"That New Year's party turned into a proper piss-up."
Where "Piss-Up" Comes From
"Piss-up" is blunt Australian and British slang combining "piss" (an old term for alcohol/beer) with "up", the same pattern seen in "knees-up."
It's been common informal usage for generations.
How Aussies Actually Use It
It describes any gathering centred heavily around drinking, often used self-deprecatingly about one's own plans.
It's considered fairly casual and a little coarse, more suited to friends than formal conversation.
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