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

  • adj. Informal Very unconventional or unusual: manic, off-the-wall creativity; off-the-wall humor.
  • adj. Informal Exhibiting bizarre behavior; crazy: their off-the-wall friends.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Wildly unconventional; bizarre; absurd.
  • adj. Greatly inappropriate.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. conspicuously or grossly unconventional or unusual


Perhaps from baseball or other games played with a ball, alluding to unpredictable bounces. (Wiktionary)



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