Don't have a hissy fit

Meaning

Do not throw a temper tantrum. It is a slightly mocking way to tell someone their dramatic outburst is childish.

Sassy, patronizing

Used in a sentence

• I promise we will stop for ice cream, so do not have a hissy fit.
• She had a total hissy fit when she didn't get her way at the meeting.
• If you have a hissy fit every time things change, you are going to be very stressed.