Someone you have sex on the same night as had failed plans to have with another person.
Man, I was pissed when Tina said she couldn't go out tonight. Luckily I was able to talk Mary into being a Pinch Hitter.
When you have sex with 3 different people in 3 consecutive nights, or 3 different people in one night. It's called a grandslam because you made it to home with 3 people.
Dude, I've got a Grandslam lined up for this weekend! Christy on Fri, Susie on Sat, and Becky on Sun!
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