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To become irrational or crazy. I'll end up going bananas if I have to work in this cubicle for one more day!
Sl. to go mildly crazy. Sorry, I just went bananas for a minute. I thought he was going to go bananas.
Act crazy, as in When it comes to animal rights, some people go bananas. According to the lexicographer J. E. Lighter, this expression may allude to the similar go ape, in that apes and other primates are closely associated with eating bananas. [Slang; second half of 1900s]
If someone goes bananas, they become very angry, upset or excited. I tried to ask about Jack. She went bananas. She sobbed and howled. The audience went bananas — anything for a bit of excitement.
go bananas1 become extremely angry or excited. 2 go mad. informal
1 1992 Jim Lehrer A Bus of My Own I predicted John Erlichman would probably go bananas when he testified the next day.
go baˈnanas(slang) become angry, crazy or silly: If I’m late again my Dad’ll go bananas. ♢ The clock’s going bananas (= isn’t working correctly).
in. to go mildly crazy. (see also bananas.) I thought he was going to go bananas.