Dumas

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.