have kittens

verb3

1. •
   Usually of a female cat, to give birth to kittens.
2. •
   (informal) To become extremely upset.

   • Your mum will have kittens when she sees what you've done to your hair!
   • My teacher has kittens every time I get a question wrong.
3. •
   (informal) To be in a state of frantic nervousness.

   • The guests are starting to arrive, but the hostess is having kittens because nothing is ready yet.