adjective, kookier, kookiest. Slang.
of, like, or pertaining to a kook; eccentric, strange, or foolish.
Also, kookie.

1955–60; kook + -y1

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World English Dictionary
kooky or kookie (ˈkuːkɪ)
adj , kookier, kookiest
informal crazy, eccentric, or foolish
kookie or kookie

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1959, Amer.Eng., originally teenager or beatnik slang, possibly a shortening of cuckoo. Noun form kook is attested from 1960.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
There are too many kooky theories around for serious scholars to attend to them
It may sound a bit kooky, but it is both logical and realistic as well as
  avoiding misery and disappointment.
Look back at the kooky ideas that past generations have had about their future,
  our present.
Sometimes the results seemed inspired, in a kooky, look-what-software-can-do
  kinda way.
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