Waste or impure matter.
Worthless or trivial matter.
The impurities in metal.
Residue that forms on the surface of molten metal from oxidation.
A waste product from working with metal.
To remove dross from.
Anything filthy or vile. Dirt; something that makes another thing dirty.
Heroin.
Semen.
Soft (or slimy) manure.
The pile of discarded cards.
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.