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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 20, 2011
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a 9 (previously 10) member kpop group. they debuted on October 10, 2016 and consist of jinho, hui, hongseok, shinwon, yeo one, yanan, yuto, kino, and wooseok. they only produce bops, please stan them
kpop fan 1 : omg have y’all heard pentagons new song humph!?
kpop fan 2 : no, I only listen to shine. :(
kpop fan 3 : I’m a universe too! humph is so good! the other songs on the album are amazing too! i love fantasystic
by mimijoji October 08, 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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Five blokes fucking one lucky lucky fuckin girl. She has a plug in the lug, is skiing and also taking it brown and pink. I fuckin wish i had me a vagina, fuck this penis i hate it.
We were all bored after dinner so the call went up....PENTAGON....Marion assumed the position and Joefus, Reece, Estacio, Pelore, and Michael all took their kek off and places. I watched from the corner...trying to ignore the hateful female flesh form revealed.
by FB January 18, 2005
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The place where Department of Defence and Department of Homeland Security work. Also the HQ of FBI.
by Udom Power October 21, 2019
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1. The new airport which opened on 9/11
2. Shape with 5 sides
1. Flight 911 to the airport, we will be shortly landing.
2. WTF A PENTAGON HAX
by N. Gin September 12, 2010
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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 09, 2004
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