Grand Slam 

A “Grand Slam” is the act of deficating on the front most edge of a toilet bowl and bringing the lid down to splatter the feces all over the place

Yo bro the janitor got so angry he had to clean up my (Grand Slam)

Grand Slam by Clarence TCS January 23, 2019

Grand Slam 

When a woman orgasms so intensly she squirts, pees, shits and even starts her period.

That wasn't an orgasm, that was a grand slam.

Grand Slam by squirty girl April 21, 2012

grand slam 

To awake one fine morn, and verily discover one's matress resembling a ordinance survey map with a rather warm chocolate log spread all over it as well as spew on your face and pillow.

"I do not think she will want to see me again after I came home totally ringbolted and grand slammed the bed, although your mum is a bit of a dirty slapper."

grand slam by Terry Fuckwit June 24, 2004

Grand slam 

When you pull your penis as far back between your butt cheeks(chicken in the rough), and put it against a window to surprise someone

When i opened the blinds my brother surprised me with the grand slam!🍆🍑

Grand slam by Joe cock February 21, 2017

Grand Slam 

Rock band former by Phillip Lynott when Thin Lizzy split up. Toured Europe continuously but never recorded anything due to Lynotts untimely death.

Grand Slam bootlegs are very sought after by collectors.

Grand Slam by black flag May 29, 2004

Grand Slam 

A male performing a one night stand with a female successfully penetrating, and ejaculating in every love hole, before going to sleep.

"Hey man, did you get with that chick last night?" Ya man, I hit a grand slam on her.

Grand Slam by Mr.nunes March 10, 2009

Grand Slam 

When you have gotten to third base with someone, and instead of loosing your V card to only them, you have a Threesome instead.

Hank: Yo man you will never guess what happened last night with Janet.
Jimmy: Did you finally get to home plate?
Hank: Even better, her sister was there and wanted in, so I got a grand slam!
Hank: word

Grand Slam by Daniel the Jewish Wordsmith July 2, 2008