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bananas

adjective [after verb]
 
 
/bəˈnɑː.nəz/ US  /-ˈnæn.əz/ informal

Definition

very silly: You're going out in this weather? You must be bananas!Stupid and sillyOf unsound mind go bananas to become extremely angry or excited: She'll go bananas when you tell her the news.Becoming angry and expressing angerExcited, interested and enthusiastic
(Definition of bananas adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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