Etymology
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kook (n.)

1960, American English slang; see kooky.

updated on August 29, 2012

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Definitions of kook from WordNet

kook (n.)
someone regarded as eccentric or crazy and standing out from a group;
Synonyms: odd fellow / odd fish / queer bird / queer duck / odd man out
From wordnet.princeton.edu, not affiliated with etymonline.