have a cow
US /hæv ə kaʊ/
UK /hæv ə kaʊ/

1.
大騒ぎする, 激怒する, かんしゃくを起こす
to become very angry, upset, or agitated about something, often over a minor issue
:
•
Don't have a cow just because I'm five minutes late.
私が5分遅れただけで大騒ぎしないで。
•
My mom is going to have a cow when she sees this mess.
この散らかりを見たら、母は大激怒するだろう。