Definition of wackadoo in English:

wackadoo

Line breaks: wacka|doo
Pronunciation: /ˈwakəduː
 
/
(also whackadoo)
US informal

noun

An eccentric or fanatical person: he seems like a good guy even if he is a wackadoo
More example sentences
  • I've just happened to come across quite a few wackadoos in my time.
  • His fanbase shifted from horny teens and MTV devotees to hardcore wackadoos.
  • Will we see fewer interviews with wackadoos in the street and just general mayhem?

adjective

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Eccentric or fanatical: out of the blue, he would do something completely wackadoo
More example sentences
  • It takes a little time to get over the wackadoo premise and for the show to really warm up.
  • The five minutes Lloyd spends reprising his wackadoo role as the piranha-infatuated biologist are entertaining enough.
  • The wackadoo radio host and conspiracy-monger is posting about this on Facebook and Twitter.

Origin

1950s: probably from wack2 or wacky.

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