"slimeball : (biology) A round lump made up of or coated with slime or a slime-like substance such as..."

“slimeball : (biology) A round lump made up of or coated with slime or a slime-like substance such as mucus.
(helminthology, specifically) A mucus-coated lump containing the cercariae (“parasitic larvae”) of a liver fluke (of the phylum Platyhelminthes).
(originally US, colloquial, derogatory) A person who is regarded as slimy (that is, sneaky or underhanded) or otherwise undesirable.”

- https://en.wiktionary.org/wiki/slimeball#English

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