When someone whom could be considered retarded, or mental/a whore believes someone or something that is out-of-the-ordinary or unrealistic is real or right. Also it is when someone (usually a chick) is just plain stupid. And when youre thinking What the Fuck is she talking about in your head....
Lauren Mattil asked what the dangling thing in her mouth was, everyone responded "Tilapia" and she said "Thats what i thought" she had pulled a major "Mattily"....

Allie was chatting with some friends when Jack decided to try pulling a "Mattily" on her... so he explained that cats were bullet proof due to the refraction causes by the bullets trajectory... she said yeah and agreed...
by Madison Palms February 28, 2009
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She is the best person you will ever meet. She is amazing and sweet and somebody you need to meet. You will love her at first sight. You will stare into her eyes and feel like you are being transformed somewhere else.
Person1: OMG have you met Mattily
Person2: OMG yes she is amazing she is so beautiful
by Anndbdjdkdkdkdkd March 22, 2018
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