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The [abbreviation] of Muck Up Day; a tradition that occurs in many schools (mostly private) on the last day of lessons for year 12s. Pranks are pulled on the rest of the school, including kidnappings, [stink bombs], cod liver oil on banisters, viagra [in the water] supply and releasing three sheep labelled 1, 2 & 4 onto the school grounds (the groundsmen look for sheep #3 which doesn't exist). Students also personalise their uniform (rip it up...). Water guns/bombs are also used and occaisonally students will hiijack the PA system. School shirts will often be signed with 'MUD (insert year)'.
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