1 definition by keep.calm.and.carry.on.x

Top Definition
MUD
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)'.
student one: did you hear that some of the guys hijacked the speakers in the main hall on muck up day? You should have been there...

student two: I can't wait for our muck up day. Wooo! MUD '11.
by keep.calm.and.carry.on.x May 14, 2010

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