We found 26 dictionaries that define the word off the wall:

General (19 matching dictionaries)

1. off the wall: Longman Dictionary of Contemporary English
2. off-the-wall, off the wall: Merriam-Webster
3. off the wall: Oxford Learner's Dictionaries
4. off-the-wall: American Heritage Dictionary of the English Language
5. off-the-wall, off-the-wall: Collins English Dictionary
6. off-the-wall: Vocabulary.com
7. off the wall: Cambridge Advanced Learner's Dictionary
8. off-the-wall, off the wall: Wiktionary
9. off-the-wall: Webster's New World College Dictionary, 4th Ed.
10. off-the-wall: Infoplease Dictionary
11. off-the-wall, off the wall: Dictionary.com
12. off-the-wall: Cambridge Essential American English Dictionary
13. Off the Wall (Fat Larry's Band album), Off the Wall (Michael Jackson album), Off the Wall (Michael Jackson song), Off the Wall (TV series), Off the Wall (album), Off the Wall (disambiguation), Off the Wall (video game), Off the Wall, Off the wall: Wikipedia, the Free Encyclopedia
14. off-the-wall: Rhymezone
15. off-the-wall: FreeDictionary.org
16. off-the-wall: Mnemonic Dictionary
17. off-the-wall, off the wall: TheFreeDictionary.com

Business (1 matching dictionary)

18. off-the-wall: Legal dictionary

Computing (1 matching dictionary)

19. off-the-wall: Encyclopedia

Medicine (2 matching dictionaries)

20. off the wall: Merriam-Webster Medical Dictionary
21. off-the-wall: Medical dictionary

Miscellaneous (1 matching dictionary)

22. off-the-wall, off the wall: Idioms

Slang (2 matching dictionaries)

23. off the wall, off the wall: Green’s Dictionary of Slang
24. American-Australian Slang Dictionary (No longer online)

Definitions from Wiktionary (Off the wall) ▸ adjective:  Alternative spelling of off-the-wall [(idiomatic) Wildly unconventional; bizarre; absurd.] Similar: offtrack, over-the-top, out-of-whack, off-the-books, out of one's head, out of one's skull, off-hand, wigged out, cray cray, off-guard, more... Opposite: mainstream, conventional Phrases: Michael Jackson's Journey from Motown to Off the Wall, bouncing off the wall, the white stuff that comes off the wall, in a off the wall manner, it may be off the wall, more... Adjectives: zany, whimmy, cheesy, droll, pickwickian, quirky, whimsical, wacky, franzy, smart ▸ Words similar to off the wall ▸ Usage examples for off the wall ▸ Idioms related to off the wall ▸ Wikipedia articles (New!) ▸ Popular nouns described by off the wall ▸ Words that often appear near off the wall ▸ Rhymes of off the wall ▸ Invented words related to off the wall