1960, American English slang; see kooky.
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.
updated on August 29, 2012