A boy that reminds you that you owe him money is a Errin.
may also be used as an adjective to describe very whorish behavior or the act of being a whore.
Jacob: Hey mate how was your weekend?
Rhye: Great dude, i scored Errin
Leonardo: *high fives Rhye*
Jacqui: Did you see what that errin is wearing?
Jacob: yeah, what a total errin.
Rhye: Hey, that total errin, she's the slut that gave me errin the other day.