I'll slice you open like an envelope - This phrase is like a middle finger from a knife. It means y

This phrase is like a middle finger from a knife. It means you're about to get gutted like a fish and you're not even worth the trouble.

"I'll slice you open like an envelope," he said, then kicked my lunch out of my hands.

"You think you're tough? I'll slice you open like an envelope and laugh while you bleed."

She said, "I'll slice you open like an envelope," and then stole my last burger.