Usually a word used to describe a cute, yet socially awkward girl. They may also have a lot of problems that they don't like to talk about. Doesn't usually talk to anyone in school or any public places. They have a very hard time ordering food or going through a checkout-line.
Person 1:"Hey, what's wrong with that girl? She looks kinda lonely."
Person 2:"Oh, I'm sure nothing's wrong, she's just a Vergessen."
He is a short little goblin that knows where you live and will rip out your ankles when he finds you.
(person 1) Hey, be careful, I was told that there was a Riley lurking around town.
(person 2) *fucking dies because Riley took their ankles*