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
by eedeen November 11, 2021
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Something that you call someone when you are displeased with them.
Person 1: I just killed your dog
Person 2: You are Muck, Eater of Muck
by Muck, Eater of Muck April 23, 2023
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A unattractive boy who acts like the shit. Cocky ugly boys
What do you think about Harrison?” “He a mucked guy”
by BratzYasmine July 6, 2020
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When the barn is absolutely destroyed, usually after a long night of drinking-related activities
The barn was SOOO mucked last night
by Runthestats April 24, 2019
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Bro 1 is looking at bro 2 who is completely out of it

Bro 2 who smoked wayyy too many cigs: bruhhhhhhh ughhhhh

Bro 1: holy shit you're mucked
by project rectangle August 4, 2023
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