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Shapemaster 

One who has mastered the art of forming shapes.

This is derived from the supervillian of an educational comic series that teaches math to children. He wears a blue morphsuit and can transform himself into a wide range of geometric shapes that are always blue and always have the same volume.
Last night Andrew turned into the Shapemaster again and entertained the crowd by forming a variety of hexagons and parallelograms.
Shapemaster by joesofresh111 November 27, 2011
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Sapmaster 

The guy who manages a sugar house in a sugar bush
I went to sapjack real quick before the sapmaster came back
Sapmaster by The sapjacker December 8, 2020

staremaster

A person who stares at you relentlessly and continuously....on and on or over and over......just cant take their eyes off of you! A person that watches your every move, for reasons of jealousy, envy, or just plain nosiness!!!
I dont know why that old man is looking at me everytime I move, he must be bored! STAREMASTER!!!!!
staremaster by biggfoxx January 13, 2011

shagmaster 

I'd go back for more - he/she's a real shagmaster. You could learn a lot from him/her
shagmaster by Dave July 8, 2003

Shaftmaster 

n./adj. A more euphonic synonym for Cockmaster.
"Shut your filthy hole, you ass-blasting shaftmaster!"

Shademister 

A person or group of people who, despite acting cooperative and supportive to your face, attempt to negatively influence others' opinions of you, cause financial or emotional harm to you or generally throw shade in the direction of you, your family or your business.
Regina is a total shademister.
Regina: Oh my God, I love your skirt! Where did you get it?
Lea Edwards: It was my mom's in the '80s.
Regina: Vintage, so adorable.
Lea Edwards: Thanks.
Regina: after girl walks away That is the ugliest effing skirt I've ever seen.

Riot Hospitality Group is a bunch of shademisters for opening their clubs during the Evening Entertainment Groups's Holiday Party.
Shademister by BBLolaMae December 11, 2018

shartmaster.69420

Genderfluid lesbian obsessed with naegami that lives on my for you page and spills facts
shartmaster.69420: cool people make me an urban dictionary page
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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."
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"Yeah... I know."
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I had a trucker's tan after driving for 10 straight hours on a sunny day.
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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.
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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.
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