Usually means: Eccentric, bizarre, or unconventional person.
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We found 4 dictionaries that define the word wackadoo:

General (3 matching dictionaries)
  1. wackadoo: Oxford Learner's Dictionaries
  2. wackadoo: Wordnik
  3. wackadoo: Wiktionary

Slang (1 matching dictionary)
  1. wackadoo: Urban Dictionary

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Definitions from Wiktionary (wackadoo)

▸ adjective:  (slang) Crazy, wacky.
▸ noun:  (slang) A crazy person; wacko.

Similar:
whackadoo, wackadoodle, wacko, whackadoodle, whacko, whacked-out, crazypants, nutsy, bonkers, wiggy, more...

Opposite:
sane, rational, normal, stable, grounded

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Similar:
whackadoo, wackadoodle, wacko, whackadoodle, whacko, whacked-out, crazypants, nutsy, bonkers, wiggy, more...

Opposite:
sane, rational, normal, stable, grounded



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