Gaag
You fake throwing up because someone did something so bad it made you want to run away and hide.
My cousin tried to eat a whole plate of spaghetti. I did the gag and he ran out of the room.
My brother tried to drink orange juice from a sock. I did the gag and he puked on my shirt.
My mom tried to cook eggs in the microwave. I did the gag and the egg exploded.