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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 

A kid who balls all day at Counter-Strike 1.6!
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
More from Urban Dictionary

square grouper

Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."
square grouper by slipsheet November 6, 2004
Word of the Day on October 7, 2026
A girl who does ballet and only talks about ballet. Her schedule is filled with dance classes which does not allow her to do any other activity.
"Hey, do you know that girl Sally?"

"Yeah, she's kind of annoying. All she ever talks about it ballet."

"Wow, what a Bunhead."

"Hey Sally, you want to hang out this weekend?"
"I can't, I have dance."
"You're such a Bunhead."

"Yeah... I know."
Bunhead by Jen00 October 24, 2014
Word of the Day on October 6, 2026

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026

Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Pee Calculus by anorlondo October 1, 2026
Word of the Day on October 2, 2026
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