slimeball

noun3

1. •
   A round lump made up of or coated with slime or a slime-like substance such as mucus.
2. •
   (offensive, figurative) A person who is slimy (that is, sneaky or underhanded) or otherwise undesirable.

   • Even slimeballs were entitled to representation, though. — 1987
3. •
   A mucus-coated lump containing the cercariae (“parasitic larvae”) of a liver fluke (of the phylum Platyhelminthes).