Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A psychotic or emotionally disturbed person.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Australia, slang A day taken off work due to (possibly exaggerated or supposed) illness.
  • noun derogatory, slang A person with unpleasant tastes, views or habits.
  • noun US, Canada, slang A mentally ill person.

Etymologies

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

[From sick.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

sick +‎ -o

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