when a guy cums on some ones face and then slams his penis across their face
man i grand slam that bitch the other day
by lui rodriguez May 14, 2007

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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.
I gave my grandma the grand slam yesterday.
by billy bob February 05, 2003

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When a girl is sucking a guys cock, the guys hits her over the head with a baseball bat and knocks her out.
Bro, I fucking grand slammed ur mom last night
by Freye December 08, 2008

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Who?
Seriously...who's that?
by gs August 21, 2003

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When you fuck a four-person family, usually both parents and both children, though this can be interchanged (Three children, one parent, etc.) to your liking. MUST be an immediate family, cannot be a cousin, grandparent, uncle, etc.
"Bro I hit a Grand Slam on that Johnson family"
by BathtubBarracuda August 31, 2016

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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!
by Agentzippo July 22, 2015

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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.
by RiddyTX June 17, 2015

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