muck up day 

muck up day is usually when year 12s do a prank similar to senior pranks. mostly used and done in australian public schools

P1 : What are you doing for muck up day?
P2 : tying a year 7 to a pole.

muck up day by eedeen November 5, 2021

Muck up day 

A day where usually year 12s do things that are not allowed e.g tying a year 7 to a pole ect. mostly done in Australia.

Year 12 N1 : What are you doin for Muck Up day?
Year 12 N2 : I’m starting a water balloon fight on the oval

Muck up day by eedeen November 11, 2021