This Internet Slang page is designed to explain what the meaning of MUCK is. The slang word / acronym / abbreviation MUCK means . Internet Slang. A list of. Define muck: wet dirt or mud — muck in a sentence. muck meaning, definition, what is muck: mud, dirt, or a sticky natural substance such as animal waste. Learn more. One goose, two geese. Spell It Can you spell these 10 commonly misspelled words? Christopher and Columbus Countess Elizabeth Von Arnim. The pile of discarded cards, as in poker: I mean what else could you expect, casinoeuro bonuscode making such a muck of it?