WordReference Random House Learner's Dictionary of American English © 2019
ˈoff-the-ˈwall,  adj. 
  1. Informal Termsvery unusual;
    bizarre:unpredictable, off-the-wall behavior.

WordReference Random House Unabridged Dictionary of American English © 2019
off-the-wall  (ôfᵺə wôl, of-),USA pronunciation adj. [Informal.]
  1. Informal Termsmarkedly unconventional;
    oddball:an unpredictable, off-the-wall personality.
  • 1970–75

Collins Concise English Dictionary © HarperCollins Publishers::

off-the-wall adj
  1. (off the wall when postpositive) slang new or unexpected in an unconventional or eccentric way: an off-the-wall approach to humour
Etymology: 20th Century: possibly from the use of the phrase in handball and squash to describe a shot that is unexpected

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