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

  • n. A person regarded as eccentric.
  • adj. Very bad: walked out of a really wack movie.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Egregious
  • adj. bad (as in not good), inauthentic, of an inferior quality, contemptible, lacking integrity, inauthentic, lame, or strange.
  • adj. crazy, mad, insane
  • n. An eccentric; an oddball; a weirdo.


Back-formation from wacky.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Back-formation from wacky. (Wiktionary)



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  • That's outta wack!

    May 3, 2009