muck-up day

World English Dictionary
muck-up day
slang (Austral) the last day of school before the annual examinations, marked by practical jokes and other student pranks

Collins English Dictionary - Complete & Unabridged 10th Edition
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Cite This Source's 21st Century Lexicon
Main Entry:  muck-up day
Part of Speech:  n
Definition:  the last day of school, esp. high school, when pranks are pulled
Usage:  Australian slang's 21st Century Lexicon
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