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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When you have a joint,Blunt,Bong,vaporizer one after another
Alfred Giggles:I have a quarter o , do you guys want to do a grand slam

Arnie Berkwitz: as long as it is free
by dj dubsack jones December 25, 2008
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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 6, 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 31, 2008
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When a guy is able to have sex with all the sisters and mother of a family.
Did you hear Dave hit a Grand Slam, he had sex with Sara, her mom, and sister (separate occasions).
by Mr.Crayonbox February 24, 2021
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when you and someone hit all the bases in one night, grand slam.
bella: yo how many bases did you hit last night?
connor: grand slam baby

“wow i hit the grand slam last night!”
by gymgirl150 February 6, 2022
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