KOOKY Meaning of KOOKY in English /kooh"kee/ , adj., kookier, kookiest . Slang.of, like, or pertaining to a kook; eccentric, strange, or foolish. Also, kookie . [ 1955-60; KOOK + -Y 1 ] Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012