Definition: kookie

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Source: WordNet (r) 1.7 

kookie
     adj : informal or slang terms for mentally irregular [syn: balmy,
            barmy, bats, batty, bonkers, buggy, cracked,
            crackers, daft, dotty, fruity, haywire, kooky,
            loco, loony, loopy, nuts, nutty, wacky]