A nickname given to a girly boy with a belly button ring fetish. He loves his awkward girlfriend but tends to cheat on her with a muffin whore named Vanessa. He can be the cutest and trolliest person in the world. You will just love him.
Mattsy: "I love you. x']"
Abbsy: "And I love you more. c':"
Girl 1: Isn't that Mattsy? Abbsy's boyfriend?!
Girl 2: He's making out with that
muffin.. What the hell.