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a person, usually female, who likes to take baths with a numerous amount of crayons (usually Crayola).
I was mattiel-ing the other night!
mattiel by sydeatsworld January 26, 2010
Mattieann is one of the most beautiful girls you will ever meet. She has a beautiful smile, and very pretty eyes. She’s super nice, and very outgoing. She’s very goofy as well. She doesn’t care what other people think of her. She defends her opinion in an argument even if everyone’s doubting her. Sometimes she has questionable actions but all in all Mattieann is an amazing person. She’s passionate, with just about everything she does. She’s smart when she wants to be. Her object of desire changes a lot, one day she’ll love being girly and the next she’ll hate it. But when she likes it she LOVES it and goes all the way. A lot of the time she’ll put her own style on things. She’s an amazing friend and you’ll be lucky to have her.
Person 1: Mattieann, you’re so pretty!

Person 2: You’re so nice and funny!
Mattieann: Smiling, thank you!!!
Mattieann by swaggyswag518 December 6, 2019

mattiefattie 

one who can't jump, but can only eat,

secret weapon: bodyslam (210 lbs.)
Matt was afraid of trash talk from Chad so he used a mattiefattie on him!
mattiefattie by Naomi Bazelli February 16, 2005

Mattieballer 

Ya that kid over there playing CS, he's a Mattieballer!
Mattieballer by Scott trys hard January 21, 2011

Mattdela effect

The assumption or thought of one image or post online that retains to the idea that it is or will be in a video by the content creator Matt Rose due to his form of content created via scrolling through funny or sometimes less known posts or images online
Guy #1 Hey look at this photo

Guy #2 wow that looks like it would be in a Matt Rose video. That gives me the Mattdela Effect