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When four or more of your friends hook up with the same girl at different times. Can only be completed if each person goes all the way (i.e. hitting a home run).
Dude, me, Bobby, Ned, and Tom hit a Grand Slam with Jennie.
In Counter-Strike, a Grand Slam is the act of clutching one versus five to win a game / series.
I hit my first ever Grand Slam the other day, you wouldn't believe it! A one-versus-five at 14-15, what a game!
When you fuck six girls at once by sticking your dick in one girls, your tongue in another, and your hands and feet in the pussy of the four remaining girls. Note: there will be a lot of moaning and it will look like you have girls growing off of your limbs.
I just Grand Slammed the six hottest girls is school last night!
Having sex with 3 women at the same time and having enough stamina to give all 3 of them an orgasm before you yourself have an orgasm.
Dude I had a grand slam last night!
When you full send for a coveted 4 days in a row
“Ready to for the long weekend?”
“Yeah, I’m going full send for a grand slam!”
Term is used to describe the event of when you wake up with major morning wood the size of a Denny's plate full of breakfast awesomeness.
Eric: I woke up on my girlfriend's mom's couch to her whole family staring at my grand slam! Needless to say, they were quite impressed.
when in a single night a person shits themselves, pisses themselves and throws up all over themselves due to drinking to much alcohol.
“Holy shit, Anika just pulled a Grand Slam”