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5.
Series of the following sexual positions performed in succession while maintaining continuous penetration: missionary then flipping to cowgirl then spinning around to reverse cowgirl and finishing with doggie style.
My boyfriend and I were so inspired by our team's gland slam that we celebrated with our own grand slam!
by zenithwit August 15, 2011
 
1.
A term in baseball when there is a runner on 1st, 2nd and 3rd, base; then the player at bat hits a home run and four runs are scored. Somewhat rare.
Do I really need an example for this? Grand Slam
by Simulationcity September 06, 2005
 
2.
Okay for this you need 4 gentlemen and a chick. A party may be a good place for this. The first three gentlemen need to make out with the chick. They each get to "first base." The bases are loaded as the "runners" advance. Finally the fourth gentleman approaches the chick and proceeds to have sexual intercourse with her. Once he "gets all around the bases" by this act he has "hit a grand slam home run." Or simply a "grand slam." The remaining gentlemen burst into the room and many hi-fives are exchanged while they all yell, "Grand Slam."
Hey I hit a Grand Slam with this chick and some help from my best buds last night.
by AAAndrew May 13, 2004
 
3.
A meal typically served at Denny's. Usually consists of a log of poo on top of a pile of vomit, no drink.
Why, yes, I think I shall try the new delicious double grand slam, make sure it's steaming.
by The Sporky August 10, 2004
 
4.
Fucking in a Denny's, usually in the bathroom.
"She and I had a Grand Slam. Oh, we ordered it, too."
by Missynoob October 03, 2012
 
6.
(n.) The act of combining Cradle and Upper Deck, thus ruining a toilet completely.
Guy 1: Have you seen the bathroom?
Guy 2: No what happened to it?
Guy 1: Someone destroyed it...with shit. They cradled it AND upper decked it.
Guy 1: THE GRAND SLAMMMM
by Ankylosaurus February 24, 2010
 
7.
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