A sex move in which you do a girl on her back on a table. Then, when you are about to jizz, you flip the table and jizz onto the pile of table and injured girl.
Then, you yell "Sic Semper Tyrannis" and run out the door, preferably breaking you ankle as you go..
Girl: Oh my gosh! What happened to your leg?
Guy: Oh, I went on a date last night and gave my girl a Gettysburg Tabletopper.
Girl: You asshole.
When you run into someone's low torso to leg region so they flip like a table.
Me and John were playing hockey, and I tabletopped him. Had to take him to the hospital for a concussion since we didn't have any helmets or safety gear. Bro was in a week long coma. Thank goodness he woke up, because I did NOT want to pay any funeral expenses. What were we talking about? Oh yeah, tabletopping.