by Robanna Lakiris November 21, 2013

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
Year 12 N2 : I’m starting a water balloon fight on the oval
by eedeen November 11, 2021

by Cnhausctky February 28, 2022

A car that has been lowered and scrapes the ground, spraying muck all over the place in rural areas. Usually has an exhaust so loud you have enough warning so you don't get covered in muck
by Skyefromstrandhill October 6, 2022

by Tessbee November 30, 2014

MuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuck
MuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuckMuck
by That handle is already in use3 June 29, 2021

The term used by gay men who keep money and or other types of payment under or around the balls and or anus.
by gay guy #940 July 1, 2016
