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1, When a person makes plans about doing something with someone else and then the person backs out at the last minute without notifiying the other person.

2, To drop out of university, college or any other educational establishment without a justified reason.
John: Hey, Himbleton invited me to see the new Batman film yesterday but he didn't show up!

Alexander: Oh dude, don't tell me Himbleton Mason'd it again
Mason'd by Prince Boobs September 12, 2009

mason vandyke’d 

to get/ or be taken advantage of sexually against your own will.
last weekend was horrible, i got mason vandyke’d at that party.

mason dallas 

Biggest wanna-be douchebag. Will give you a handshake and hug then talk shit about you as you turn around. Watch out for double first names!
That dude is a MASON DALLAS for sure
mason dallas by Roseville DB January 25, 2018
v. To get so pissed off at something you did wrong, you kick a chair and break a toe (or two)

It is coined after, Philadelphia Phillies relief pitcher Ryan Madson kicked a chair after allowing the tying runs to score in one of his outings during the 2010 MLB Regular Season.

Note: if a chair isn't available, a wall or any hard surface will do.
After failing the test, Bobby was so pissed he Madson'd himself and broke his big toe.

After blowing the save in two consecutive nights, Dan Madson'd himself and was out for the next two to three months with a broken toe.
Madson'd by B3mac995 July 17, 2010

Mason "Dipper" Pines 

One of the main character in the Disney animation by Alex Hirsch. #GravityFalls It's divided into 2 seasons with weirdmaggedon as the final episodes. Try it!
Mason "Dipper" Pines Does Not Like To Be Called Mason. He Likes To Be Called Dipper, Because Of His Birthmark On His Forehead That Looks Like The Big Dipper.

Mason Dixon Line 

The boundary between Maryland and Pennsylvania. A symbolic dividing line between the North and the South before the Civil War. The two surveyors who mapped the line, Charles Mason and Jeremiah Dixon, are the namesake for the imaginary border.
Once you've crossed the Mason Dixon line headed North, you're not likley to find a Waffle House.
Mason Dixon Line by ebradfor November 12, 2005
More from Urban Dictionary
anyone who succeeds in disgracing/over indulging themselves in the throws of clubland
28 hours and 4 clubs later, gurning for england but still refusing to go home - a total wrongun!!
wrongun by bevvers March 21, 2007
Word of the Day on October 8, 2026

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
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