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The act of four men simultaneously penetrating a man or woman's anus as a form of group anal sex. This, while appearing at first to be physically impossible, is actually performed using two supports (like a chair or an ottoman) beneath the two men at either side, while the third man lies on his back and the fourth man stands in the center behind the recipient.

So named after the author of The Three Musketeers, in reference to the notion that famed Twitter user @GothCharlotte claimed that this act could only ever be performed by three men and a machine, but like d'Artagnan, a fourth man is all that's needed to complete this masterpiece.
"We did it. We finally did it. Me, Athos, Porthos, and Aramis did the Dumas last week with Constance Bonacieux.
Dumas by jrmj July 23, 2019
Related Words
Congratulations you just spelled dumbass wrong therefore making you a dumbass
Jim:Hey, Liam is such a Dumas
Paul:Did you just misspell dumbass?
Dumas by Princess Walnut January 8, 2020
You are the most dumb person I have ever seen
Ur a dumas
I think you're the dumbass
Dumas by I use dictionaries June 10, 2021
A shorthand, slang term for dumbass. usually used if someone is incredibly stupid.
Guy 1: Bro watch me do a flip off this fence!
Guy 2: What a fucking dumas…
dumas by MapleKip August 6, 2021
Dumás Pronounced::(Duh-monz)
1.A Fearless, fierce, flamboyant and demanding character.

2. Divo ; A male Diva

3.Over the top male.

NOTE:: No to be mistaken with Dumas (Doo-mahs)

Dumas: (Doo-mahs) is a dumbass
Dumás: (Duh-monz) is a Divo
He is so bossy! He's such an Dumás

He is fearless, he is Dumás
Dumás by QueenHoneyBee March 24, 2010

Gaping Dumas 

1. An anus which has been probed and penetrated to the point that one's head will fit inside their respective anal cavity.

2. Anal cavity that can entertain objects 12 inches in diameter or larger.
Hey John, get your fingers out of your asshole! You already have a slim dumas. You want to end up with a flaccid, amorphous gaping dumas too?
Gaping Dumas by Ham Glaze Washington November 29, 2010