Ground Rule Double 

Copping a feel on a girl without ever making out. Most commonly occurs at parties or dance clubs. Named for the circumstance in baseball when a player hits a ball and it bounces over the wall. He automatically advances to second base.

Person 1: Dude, did you see me grabbing that girl's tit when we were dancing? I totally just got to second base in like 5 minutes.

Person 2: I'm not sure if that qualifies as second base. It's more like a ground rule double.

Ground Rule Double by gabulldogs123 August 23, 2008

Ground rule double 

When a chick (accidently) touches you with her boobs.

Guy: That chick just totally ground rule double'd my shoulder for a good 5 seconds.

Dude: Awesome.

Ground rule double by Dref321 October 4, 2009

Ground Rule Double 

Having cyber-sex with your significant other. This is referred to as a ground rule double because even though you may think you are going pretty far, you can ultimately only get to second base.

Eric: "How did your Skype conversation with your girlfriend go the other night?"

Sean: "Ground rule double every time bro!"

Mel: "LOLS"

Ground Rule Double by BerkeleyStudentFoodCollective September 23, 2011

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

ground rule double 

When a male cannot have an erection he inserts his testicles in to the vagina instead.

i was so drunk i had to give her the ground rule double.

ground rule double by Ian Floetl September 21, 2005