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A loud, annoying way of saying you really want something, like a snack or a crazy sight. It’s basically your brain screaming in public.
I SHUMMM??! I’m not even joking, I’ll eat your face if you don’t share that pizza.
I SHUMMM??! That chicken wing looked like it was doing push-ups.
I SHUMMM??! I saw a guy wearing socks as shoes. It was a crime.