1 definition by Virginialikeswomen
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.
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