A person who is really into most if not all types of anal/ass play (see muck dugout). Not to be confused with "muck chucking" although the terms can be used interchangeably. Muck refers to mostly feces in this case but it surely is not limited to it (see muck chucking).
Person A: "Oh boy, he's waist deep in that tar pit, we should probably help and get him out before it's too late."
Person B: "You're right, you could say he is halfway to becoming a real Muck Daddy"
by pseudonyms are hard May 5, 2021
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A way to explain that you’re eating. Usually something that will make you full.
“Hey Dave do you want to go get tacos?”

Yep im ready to muck the barrel”
by Donald S. Duck January 4, 2018
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The time period when Valve released a TF2 update with spaghetti code that forced the crate series to always drop unusuals. This resulted in the unusual market crashing with absolutely no survivors left.
The Crate Muck-up was one of the worst disasters in TF2 history.
by FL4ym3Burn July 26, 2019
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when someone is in a not so good situation causing them to be stuck there not knowing what to do ; usually only used at clover
by yo hear what joe did November 13, 2019
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1. Consciously, with very firm motivation, doing whatever the f**k you want, whenever the f**k you want, however the f**k you want, with whomever the f**k you want, simply because YOU can without explanation, rhyme, or reason as to why, all while having the most fun ever and avoiding the law.
Have you seen or heard from Lesha or Lauren because I heard they were runnin-a-muck again...
by creatorofquinn January 28, 2021
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