Definitions

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

  • n. Slang A deranged, psychotic, or morbidly obsessed person.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A day taken off work due to (possibly exaggerated or supposed) illness.
  • n. A person with unpleasant tastes, views or habits.
  • n. A mentally ill person.

Etymologies

From sick1.
(American Heritage® Dictionary of the English Language, Fourth Edition)
sick +‎ -o (Wiktionary)

Examples

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