Definition of "muck"

muck

/mʌk/

noun
usually uncountable, plural mucks
1. Slimy mud, sludge.
2. Soft (or slimy) manure.
3. Anything filthy or vile. Dirt; something that makes another thing dirty.
4. Grub, slop, swill
5. (obsolete, derogatory) Money.
  Quotations
  the fatal muck we quarrell'd for
  c. 1622, John Fletcher, Philip Massinger, “The Sea-Voyage. A Comedy.”, in Comedies and Tragedies […], London: […] Humphrey Robinson, […], and for Humphrey Moseley […], published 1647, Act V, scene ii
6. (poker) The pile of discarded cards.
7. (Scotland, slang) Heroin.
8. (slang) Semen.
  Quotations
  Ah blurt oot ma muck n pull oot.
  1994 , Irvine Welsh, “Bang to Rites”, in Trainspotting, London: Minerva, page 219
verb
third-person singular simple present mucks, present participle mucking, simple past and past participle mucked
1. To shovel muck.
2. To manure with muck.
3. To do a dirty job.
4. (poker, colloquial) To pass, to fold without showing one's cards, often done when a better hand has already been revealed.
5. (Australia, informal) To vomit.