dirt, rubbish, or waste matter Meaning, pronunciation, example sentences, 'I'll just clean the muck off the windscreen' . 'why do you let her read this muck?'. Mucking down a sloppy joe right now text me later. One side has the word, one side has the definition. walking (aka mucking) through a big muddy area. Mucking definition, damned. First recorded in ; muck + -ing2 Did you consult study any guides as you were mucking your way through? See Lord Muck , Lady Muck. The group says some newer studies mucking up the healthy heart message didn't consider these dietary replacements. Seen and Heard What made you want to look up muck? British Dictionary definitions for muck Expand. Also called muck soil. Please log in or register to use bookmarks. That's massage and fucking, fucking. Write what you mean clearly and correctly. Muck - definition of muck by The Free Dictionary http: Agriculture farmyard dung or decaying vegetable matter. Need even more definitions? A Woman With An Attractive Body But An Ugly Face.