Gaag
You make a face like you’re about to vomit because someone did something so nasty it made your stomach hurt.
My friend ate a dead mouse. I did the gag and my friend said I was the mouse’s new best friend.
My sister tried to paint her face with ketchup. I did the gag and she said I was a tomato.
My brother tried to eat a whole onion. I did the gag and he cried like a baby.