"Shut up" in a ridiculous manner. Usually telling someone who has said something idiotic, and therefore matching their
idiocy with "Cheet Epp!"
Sometimes said numerous times getting louder and louder and more and more annoying/ridiculous. Thus warning the victim to stop their banter and get a brain.
Idiot Girl 1: OMG Garlic Aioli is like, MY LIFE. I couldn't live without it. It's actually my life!
Logical Bystander: CHEET EPP!!!