wackadooEnglishOxford Dictionary of Englishwackadoo /ˈwakəduː / (also whackadoo) US English informal, derogatory ▸ noun an eccentric or fanatical person: he seems like a good guy even if he is a wackadoo. ▸ adjective eccentric or fanatical: out of the blue, he would do something completely wackadoo. – ORIGIN 1950s: probably from wack2 or wacky.
EnglishOxford Dictionary of EnglishEnglishOxford Dictionary of English
EnglishOxford Dictionary of English