Reverse Double Penetration 

When the balls go in one girl and the dick goes in the other

The tables turned when I turned the threesome into a Reverse Double Penetration

Reverse Double Penetration by Keveanureeves December 25, 2022

Rocky Mountain double 

is when you have a threesome with a lady and her mom.

when you go to a bar pick up a young lady and she takes you home and you have a threesome with her and her mother that is a Rocky mountain double

Rocky Mountain double by Rockhoundcolorado December 15, 2008

Ground-Rule Double 

When a guy finds himself in an unclear sleeping situation with a woman, he is entitled to "take second base" without comment or condemnation.

Guy #1: "Yo, I heard that (insert female name here) crashed in your bed last night."
Guy #2: "Yeah...nothing happend."
Guy #1: "What? You declined a ground-rule double!"
Guy #2: "Shit! Did I really?"
Guy #1: "Yeah, you were definitely entitled to boobie touch-age."

Ground-Rule Double by Cal Ripken Jr. April 2, 2011

double inverted hi-c rudebayga 

when you jack a hawaiian off and when he cums catch it and slap him in the face with it.

gary just gave me double inverted hi-c rudebayga last night it was fucking crazy.

double inverted hi-c rudebayga by garyplorence May 25, 2009

Ground Rule Double 

Similar to an Upper Decker, except you 1st lay a turd on the toilet bow lid. You then remove the lid from the upper tank and rapidly fling the toilet bowl lid into the open position, catapulting the turd into the upper tank. This is worse than an upper decker, because not only does the owner have a turd to fish out of the tank, but they also have a lid that requires cleaning as well.

Q: Why is their poo on the toilet lid?

A: Damn it, someone hit a ground rule double before they left our party!

Ground Rule Double by MerkXRTurbo May 5, 2011

Ground Rule Double 

When with a women you start off by swinging for the fences but something happens to where you are forced to stay at 2nd base.

"I was with this hottie last night, but my brother kept walking in the and out of the roomie, so instead of a home-run, I got a Ground Rule Double"

Ground Rule Double by LSD Loudmouth July 31, 2012

ground rule double 

Variation on upper decker. Instead of shitting in the tank of a toilet, shitting in the bowl and then manually repositioning the load to the tank.

I was so drunk I forgot to do an upper decker, but after I saw the sweet log I fired into the bowl I knew I had to go for the ground rule double.

ground rule double by Dismukes March 13, 2004