parallelepiped 

A sexual act in which two people are bent over side by side while each of such people are being penetrated from behind.

Dude, those chicks get parallelepiped!

parallelepiped by NerdizzleNoob August 18, 2021

parallelepiped 

The sexual act of double penetration wherein the penetrating phalluses extend in the same direction.

Dude, we parallelepiped that chick for hours!

parallelepiped by NerdizzleNoob August 18, 2021