Definition of wacko in English:

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Pronunciation: /ˈwakəʊ/
(also whacko) informal, chiefly North American


Mad; insane: his wacko conspiracy theories
More example sentences
  • Equally disturbing is what sort of messed up wacko ideas are floating around their heads regarding what is going on in the real world.
  • One of the perks of Adrants is that it spots new, whacko trends in the advertising world just about sooner than anyone.
  • I'd already done the book on Cobain's murder and I didn't want to get typecast in the book world as this wacko conspiracy nut.

noun (plural wackos or wackoes)

A crazy person: a trailer park peopled by exotic wackos and misfits
More example sentences
  • In any case, I do think that trying to characterize the anti-war movement by the wackos is just what I said: a misrepresentation of the political opposition.
  • This is not to say we didn't get our share of itinerant whackos.
  • It appears to me to be one whacko testifying against another.


1970s: from wacky + -o.

Words that rhyme with wacko

tacho, taco, tobacco
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