A term more commonly used in the UK, it is simultaneous defecation and vomiting, usually upon oneself. Normally occurs post heavy-drinking.
Did you see that bloke who just Grandslammed in the bathroom?
by Chewy L. May 20, 2006
A Grandslam is the upgrade of a Strikeout. Whereas a Strikeout is consumed in the order of marijuana, liquor, and beer, a Grandslam is performed by conusuming a line of Cocaine to leadoff the order. So it goes line of Cocaine, Bong Rip, Shot, Beer Chug, Release smoke. Grandslam.
Jack took a shotgun last night and was a badass until Ryan outdid him by pulling out a line and introducing us to the epic grandslam.
by big_tymer8067 December 11, 2011
to shit ,piss and vomit at the same time,usually when drink or disorientated from some sort of cock-slapping festival.
Jesus! shes shat herself and pissed the bed! OMG deres vomit in here aswell. what a grand slam!
by Smiff2790 March 14, 2006
When you have sex with 3 different people in 3 consecutive nights, or 3 different people in one night. It's called a grandslam because you made it to home with 3 people.
Dude, I've got a Grandslam lined up for this weekend! Christy on Fri, Susie on Sat, and Becky on Sun!
by Bayushi_Koso September 09, 2011
a common sex act in the colorado and rocky mountain area in which one sexual partner purchases a grand slam from Denny's restaurant, places the entire meal in his or her partner's ass, and eats the entire thing seasoned as preferred...hot sauce is commonly recommended
I was hitchhiking with a trucker, when we became really hungry. As we passed by Denny's, we decided the best way to fix our qualms would be to share a grand slam.
by rossthehaus June 07, 2011
When you go from first base, to second, to third, and to fourth base multiple times throughout the night.
"Dude last night I got a Grand Slam from Ashlee"
"Nice Bro! I would kill to even go to first with her!"
by TheLoveDrunkPoet June 23, 2012
The act of lodging the wide end of a tennis racket into ones rectum.
After I was done cumming on Jenny, I finished her off with a Grand Slam.
by TheCerealKiller June 16, 2014
Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.