The place where Department of Defence and Department of Homeland Security work. Also the HQ of FBI.
by Udom Power October 22, 2019
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Five male individuals jerking each other off in the formation of a pentagon. Each participant's arms are positioned on the two adjacent erect penises, while reciprocating motion is perfomed to stimulate all of the penises.

Although Pentagon's as a religion first appears in Greek records during the Hellenistic period and the earliest mention of 'The 5 erect penises' is inscribed on the Merneptah Stele dated 1213–1203 BCE, religious literature tells the story of the pentagon going back at least as far as c. 1500 BCE. The Pentagon became widespread throughout histroy, beginning with the Cock conquest and continued on a much larger, firmer scale with the Penta-quest.
"That's a nice firm handshake, that'd be perfect in our pentagon"

"Alright class, split into groups of 5. If you know what I mean ;)"

"I'd do anything for a chance to stand in the middle of that raging pentagon"
by PentaKyle June 18, 2015
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*A shape with 5 corners.

*Another name for the USDoD, which is a massive, pentagon-shaped building (hence its name), which serves as the center for all national defense information, planning, coordinating, etc etc.
"Donald Rumsfeld is the Secretary of Defense. He's also bad-ass."
-me
by Dave September 9, 2004
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The five sided building which was allegedly hit by a plane. However, why was there only a 14 foot wide hole in the wall, and no plane debris anywhere...?

Check the facts and you'll be shocked..
A plane hit the pentagon on 9/11

More like a missile if you look at the facts..
by Prem Shah September 27, 2006
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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
by Abraham bin Laden December 5, 2008
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pentagon is a kpop group which consists of 10 members. leader aka hui is whipped for edawn (a rapper) wooseok the youngest is married to yuto the japanese member jinho(e) is the oldest but is dating everyone else
omg did you see pentagon! they are skinny legends & kings who outsold everyone
by wooseokchenlesanha July 6, 2018
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like being a square, but you are stupid 5 times in a row instead of 4.
Mike: Wow, what a square!
James: No, she's a pentagon, she has been way more stupid that.
by Cheesey Wackjob February 21, 2011
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