Penertia 

Penis + Inertia

The tingle in your testicles when riding down a rollercoaster or driving over a bump on the road too fast.

Hey could you slow down? That speed bump gave me penertia.

Penertia by tacwum March 16, 2020

double anal penertration

when two dicks go up some one's ass

i saw it on a porno one time!!

double anal penertration by james howard December 28, 2003