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A way to show you're so mad or happy you're about to explode. People might think you’re actually raising cows in your backyard. If you’re dumb enough to go along with it, make loud noises and squeeze your butt like you're giving birth to a cow in a public bathroom.
I'm gonna have a cow when I see my ex with my mom at the grocery store.
My dog ate my homework. I'm gonna have a cow.
When my teacher gave me a D on my math test, I had a cow and a half.