go bananas

From banana oil (“nonsense”) or bananas (“crazy”).

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go bananas (third-person singular simple present goes bananas, present participle going bananas, simple past went bananas, past participle gone bananas)

1. (idiomatic, informal) To get angry; to go mad.

   I just told her she couldn’t have any pudding until after dinner, and she went bananas!

2. (idiomatic, informal) To become silly or excited; to go crazy.
   • 1982, Douglas Adams, Life, the Universe and Everything, page 49:

     The music was going bananas with immensity at this point.

• go ape
• go nuts