What it means
To go bananas means to go properly wild for a minute, getting way too hyped, too angry, or too worked up, so all your normal chill flies out the window. It's playful and exaggerated, not something you'd use for real mental health stuff. You say it when someone starts kicking off, screaming, celebrating, or making a full chaos spectacle.
Usage examples
"When we nicked that last-minute winner, the whole pub went bananas, pints everywhere, random blokes hugging, and the barman telling us to pack it in."
"The whole pub went bananas when the winner went in during stoppage time, pints flying everywhere, total chaos."
"My dad went bananas when he saw the phone bill, I have never seen him that red in the face."
"The kids went bananas when they clocked the ice cream van turning onto the estate."
"She went absolutely bananas when Beyoncé came out, proper screaming, phone in the air, nearly dropped her chips."
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Where it comes from
This caught on in American English in the 1960s. Banana had already been floating around as slang for crazy or silly, so go bananas grew out of that pretty naturally. From there it stuck as an everyday way to describe someone getting wildly excited, agitated, or briefly out of control.
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