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1.
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.
by Abbsy March 06, 2012
 
2.
loud, one who is extremely loud and boisterous
wow that mattsy is loud!
by jemsrevenge March 28, 2009