Go bananas

Meaning

To go bananas is to become irrational, excited, or completely wild. It implies a loss of composure that is usually temporary and often quite fun to watch.

Playful, energetic

Used in a sentence

• The kids will go bananas when they see the bounce house in the backyard.
• My boss is going to go bananas if he finds out we missed that deadline.
• She went bananas when her favorite song started playing at the wedding.