The British Idiom – Go bananas
Definition of Go bananas
To go bananas means to become very angry, emotional, or mad.
Examples of Usage of Go bananas
Dad’s going to go bananas when he sees what you’ve done to his car. When he saw the photoshopped image of himself on the computer I thought he was going to go bananas, but he just burst out laughing instead.
Now watch my YouTube video English lesson which contains this British English idiom.