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wacko

/ˈwækəʊ/
noun

  1. An amusingly eccentric or irrational person.

Synonymskook, odd duck, weirdo
adjective

  1. Amusingly eccentric or irrational.

Synonymskooky, oddballish, pixilated
interjection

  1. Hurrah!

Synonymsget in, huzzah, woo hoo

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