Meanings
From banana oil (“nonsense”) or bananas (“crazy”).
How to pronounce "go bananas":
AU
To get angry; to go mad.
Example: "I just told her she couldn’t have any pudding until after dinner, and she went bananas!"
To become silly or excited; to go crazy.
Example Sentences
1
The kids always go bananas when they see the ice cream truck.
2
My boss will go bananas if this report isn't finished on time.
3
I'll go bananas if I have to wait in this traffic jam any longer.