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 7, 2012
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Professional correspondence that contains what appears to be a poorly written text message.

An example of a "mattsie" would be a formal letter that includes the following: "She is a he haha he gets it all the time....he will be on time."
I made a mattsie in my last report and the report review staff rejected it.
by Coyote Bank Commander December 10, 2014
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loud, one who is extremely loud and boisterous
wow that mattsy is loud!
by jemsrevenge March 28, 2009
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Mattsy is an amazing person, If you have one in your life you're super lucky to have them! They are an amazing friend, with great personality, inside and out! A Mattsy is a kind and caring person. All Mattsy's deserve the world, but always seem to deny that. Mattsy's have many good qualities including: Smart, Loyal, and Creative. Everything a matt does should always be praised!
💚
Person 1; That person is an amazing person!
person 2; You know what that means?
Person 1; No?
Person 2; It means they must be a Mattsy!
by LocalZarii October 15, 2020
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