Galgore
An old name for a really bad killer who murdered so many people, it was like a horror movie. It came from a demon that made whole villages cry and then ate them.
"You’re a Galgore, I swear. You killed my dog and my dog’s best friend."
"My uncle is a Galgore. He killed 15 people for stealing his last donut."
"The principal called me a Galgore for screaming in the hallway."