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 17, 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 5, 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 5, 2003
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A game usually played at high school dances, who's objection is to make out with at least one person from every grade, including your own. Another variation of the game is that, in order to win, you count each person you make out with by points. Someone in your own grade, for example, could rank as lower points than someone in the senior grades. The person with the most points win.
Virginia: We should totally play Grand Slam at semi tonight.
Jared: I definitely won Grand Slam; I'm only a niner and I made out with over 12 grade twelve bitties.
by Virginialikeswomen February 21, 2011
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When four guys blow their gooey loads on a person's face; male or female.
Calvin gave up a Grand Slam to Jeter, Rodriguez, Posada, and Giambi.
by Pvt. Twitchy April 29, 2007
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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 9, 2008
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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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