Definition of wackadoo in English:

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Pronunciation: /ˈwakəˌdo͞o/
(also whackadoo) US informal


An eccentric or fanatical person: he seems like a good guy even if he is a wackadoo
More example sentences
  • Elevating these wackadoos to even the most carefully vetted legitimacy lowers a writer to an idiot.
  • Please do not let one wackadoo ruin it for the rest of us.
  • It annoys the hell out of me when wackadoos like this reproduce!


Eccentric or fanatical: out of the blue, he would do something completely wackadoo
More example sentences
  • Luckily, they found an ad campaign that adequately suits his whackadoo personality.
  • The worst part of it is the crazy, whackadoo headdress she makes her model wear.
  • In hindsight, though, they do seem like pretty whackadoo ideas.


1950s: probably from wack2 or wacky.

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