1. a. Mentally deranged. b. Informal Odd or eccentric in behavior. 2. Informal Departing from proportion or moderation, especially: a. Possessed by enthusiasm or excitement: The crowd at the game went crazy. b. Immoderately fond; infatuated: was crazy about boys. c. Intensely involved or preoccupied: is crazy about cars and racing. d. More @Wikipedia
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