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the pentagon 

a group of five people who believe themselves to be much better than the rest of their friends
a group of five residents of Porter Hall at Miami University call themselves the pentagon
the pentagon by Abraham bin Laden December 16, 2008
Noun. Kpop boy group that debuted on October 10th, 2016 (10/10) and is produced by entertainment company Cube. Consists of ten members: Jinho, Hui, Hongseok, E.Dawn, Shinwon, Yeo One, Yan An, Yuto, Kino, and Wooseok.

The group debuted with the song Gorilla and is currently very active in both Korea and Japan. They also had a variety show called Pentagon Maker to showcase their skills before debut. Their fandom name is called "Universe."
Universe: Wow, I love Pentagon so much! They have so much fan service!
International Universe: Wow, I can't wait until Pentagon comes to my country for a concert and then leave the very next day!
Pentagon by kinotherapy December 11, 2017
The pentagonal building serving as the headquarters of the US Department of Defense, near Washington, DC. The Pentagon's unique shape makes it a highly efficient office building. Although the Pentagon has 3,705,793 square feet (1,129,526 meters) of office space, it is possible to reach most points in the building within 10 minutes, a remarkable architectural achievement. In a building which coordinates the armed forces of the United States along with organizations responsible for intelligence and security, workers often need to be able to access each other quickly.
The idea of the Pentagon was conceived in 1941, when Brigadier General Brehon Sommervell was trying to solve the problem of limited space for the Department of Defense, a serious issue in the Second World War. It was agreed that a new building was needed, and a groundbreaking ceremony took place on 11 September, 1941. It took just two years to complete the building on former marshlands along the outskirts of Washington, and the Pentagon was quickly filled with communications equipment and staff to coordinate the Department of Defense.
Pentagon by Dancing with Fire September 6, 2012

Pentagon of trust 

After the huge success of the the triangle of trust, two new members have been ordained into the Wolfpack. With two new members comes two new erect penises and a total 5. The pentagon is formed by 5 erect penises being connected from head to the base of the shaft of the member to your left. During the ceremony of the pentagon of trust its important to look each other in the eye. The pentagon of trust is considered the epitome of heterosexual male relationships and should not be mistaken for homosexual activity.
Hey lads come over and let’s perform the pentagon of trust ceremony tonight.
Pentagon of trust by Wolfpacknz September 12, 2019

love pentagon 

Similar to a love triangle, only with more people involved.
Jill: "I love Tom! He's my bae!"
Tina: "I love Tom! He loves me too!"
Sophia: "I love Tom! We talk everday!"
Hannah: "I've loved Tom for 2 years!"
Tom: "shit. I've created a love pentagon.."

Tom: *really fucked up. Currently talking to 4 girls because he doesn't know how to cut off the old ones and the new ones just keep comin'!*

Pentamento 

a blog about pens and poetry
Pentamento a play on words for "pens"
Pentamento by Ontheroad December 23, 2008
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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