Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Slang A despicable or disgusting person.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A person who is slimy (in the figurative sense of underhanded, sneaky).

Etymologies

slime + -ball (probably as in oddball).
(American Heritage® Dictionary of the English Language, Fourth Edition)
slime + ball (Wiktionary)

Examples

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