To dig into the ground, especially with a shovel.
To search thoroughly and carefully for information, research, dig into, penetrate, fathom, trace out
To dig; to excavate.
To shovel muck.
To manure with 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.
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.