Etymology
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kooky (adj.)

1959, American English, originally teenager or beatnik slang, possibly a shortening of cuckoo.

Using the newest show-business jargon, Tammy [Grimes] admits, "I look kooky," meaning cuckoo. [Life magazine, Jan. 5, 1959]

Related: Kookily; kookiness.

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Definitions of kooky

kooky (adj.)
informal or slang terms for mentally irregular;
Synonyms: balmy / barmy / bats / batty / bonkers / buggy / cracked / crackers / daft / dotty / fruity / haywire / kookie / loco / loony / loopy / nuts / nutty / round the bend / around the bend / wacky / whacky
From wordnet.princeton.edu