off-the-wall

• off the wall

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

• Audio (AU)

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off-the-wall (comparative more off-the-wall, superlative most off-the-wall)

1. (idiomatic) Wildly unconventional; bizarre; absurd.

   What kind of a harebrained, off-the-wall idea is that?

   She is a very off-the-wall character.

2. (idiomatic) Of a person's behaviour: greatly inappropriate.
   • 2012, Reginald Pierce, The Paladin, page 204:

     All of their friends were amazed that they were familiar with a war hero. Some began to understand Chips' moods and drinking. His "off the wall" behaviour at times. And unknowingly they were "forgiving" him.