go bananas

listen to the pronunciation of go bananas
الإنجليزية - التركية
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keçileri kaçırmak
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الإنجليزية - الإنجليزية
To go mad

I just told her that she couldn't have any pudding until she'd finished her main course, and she went bananas!.

(informal) become (or be) mad, angry, or excited
To be irrational and wild; to lose control. - "I knew Joe would go bananas when he found out he's not getting a raise this year."
go crazy; lose one's mind; get excited