involved with sexual intercourse. you start off knowing that you are going to round all of the bases. As you round all of the bases, you waive to the crowd like a pro. you take your time to round all of the bases to get the full enjoyment out of the moment. Then when u get past the home base, you high five your team who are all lined up from the plate to the dug out - and the party doesnt stop there.
i hit that chick for a grand slam, then we went around again for a victory lap
by ummmm.. what tha May 30, 2005
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Wendy's term: Used when fry person needs a serving of fries, nuggets AND strips. Originally used by Luke and was forced into Wendy's terminology by Perry.
I need a grand slam!

Grand slam?

Fries, nuggets and strips!!
by DesPERRYado February 13, 2005
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During intercourse, one takes out a baseball bat and rams it into the anus, ad=nd when the bitch screams, take it out and knock her ass out.
by billy bob February 05, 2003
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A sex move that involves two guys getting it up the ass in weird ways.
Eww, I heard Jamie was Grand Slamming Jordan last night!
by Forgott|e|n July 30, 2008
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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
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when the turd you're shitting starts touching the water in the toilet bowl, while still attached to your arsehole.
Evrytime i eat Tex-Mex, i get a Grand Slam
by Nicoprofound January 05, 2006
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When you have a one night stand, but get a piece of ass regardless. Whores do this. And they don't even have to date!
Yo mom had a grand slam date with me last night! Have fun with your new baby brother!
by DeAssFucker December 04, 2003
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