Slime-ball

The slime-balls, which are whitish and have fluid gel-like consistency and in which the cercariae lie in free state, appear 120 to 150 days after the ingestion of eggs by the mollusc.

Source: wiktionary

[T]he man held the view that ‘All car dealers are slime-balls’ which, naturally enough, led to anxiety whenever confronted by a car dealer. Once this belief was challenged as an over-generalization, the man’s anxiety when buying a car subsided [...].

Source: wiktionary

Nelson was a slime-ball, suck-ass, piece of shit that every good story truly needs.

Source: wiktionary