Slimy mud, sludge.
The car was covered in muck from the rally race.
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Soft (or slimy) manure.
I need to clean the muck off my shirt.
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Anything filthy or vile. Dirt; something that makes another thing dirty.
What's that green muck on the floor?
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Add your own interpretation of "muck".
Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.