Usually means: Eccentric person with bizarre behaviors.
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We found 23 dictionaries that define the word wacko:

General (20 matching dictionaries)
  1. wacko: Longman Dictionary of Contemporary English
  2. wacko: Merriam-Webster
  3. wacko: Oxford Learner's Dictionaries
  4. wacko: American Heritage Dictionary of the English Language
  5. wacko: Collins English Dictionary
  6. wacko: Vocabulary.com
  7. Wacko, wacko: Wordnik
  8. wacko: Cambridge Advanced Learner's Dictionary
  9. wacko: Wiktionary
  10. wacko: Webster's New World College Dictionary, 4th Ed.
  11. wacko: Infoplease Dictionary
  12. wacko: Dictionary.com
  13. wacko: Cambridge Essential American English Dictionary
  14. Wacko (TV series), Wacko (disambiguation), Wacko (film), Wacko (game), Wacko: Wikipedia, the Free Encyclopedia
  15. wacko: Rhymezone
  16. wacko: FreeDictionary.org
  17. wacko: Mnemonic Dictionary
  18. wacko: TheFreeDictionary.com

Miscellaneous (1 matching dictionary)
  1. WACKO: Acronym Finder

Slang (2 matching dictionaries)
  1. wacko: Green’s Dictionary of Slang
  2. wacko: English slang and colloquialisms used in the United Kingdom

(Note: See wackos as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  (informal) Amusingly eccentric or irrational.
noun:  (informal) An amusingly eccentric or irrational person.

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