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by dredmorbius 709 days ago
Straight Dope also has a good 'splainer:

The story of bananas is a lot shorter and more mysterious. Here the OED can reliably get us back only to 1968, when a University of South Dakota publication called Current Slang reported that Kentucky college students (of “both sexes”) were using bananas to mean “excited and upset; ‘wild.’”

<https://www.straightdope.com/21344487/how-did-em-nuts-em-and...>