| Noun | 1. | piss-up - vulgar expression for a bout of heavy drinking binge, tear, bout, bust - an occasion for excessive eating or drinking; "they went on a bust that lasted three days" Britain, Great Britain, U.K., UK, United Kingdom, United Kingdom of Great Britain and Northern Ireland - a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom |