I'll eat your soul - A threat that's so strong, it's like you're using your mouth

A threat that's so strong, it's like you're using your mouth as a vacuum cleaner for someone's spirit.

"I'll eat your soul," he said, right before he took a big bite of a taco.

"You're gonna be my next snack," she said, while eating a whole cake.

"I'll eat your soul," he said, while eating a whole pizza by himself.