Cocaine.
A banana that is extra small in size.
A penis.
A police officer.
A railway signaller.
A calf that is slaughtered in its first month, usually because it has no mother or because it is undersized or otherwise defective.
Heroin.
Semen.
Soft (or slimy) manure.
The pile of discarded cards.
Anything filthy or vile. Dirt; something that makes another thing dirty.
Grub, slop, swill
Slimy mud, sludge.
To manure with muck.
To shovel muck.
To vomit.
To do a dirty job.
To pass, to fold without showing one's cards, often done when a better hand has already been revealed.