A term usually used in video games. The act of jumping on top of someone or something to kill/destroy it. Much like jumping on Goomba's in the Mario games.
Player1: Dude, I totally Goomba-stomped the guy at the bottom of the elevator shaft.
Admin: Goomba stomping is not allowed!
When one guy become mario and takes your girl that you wanted, he Goomba'd you.
Chris: Why don't you like Greg?
Alex: I liked a girl name Madison. But Greg came in and Goomba'd me and now they are together. Rest in spaghetti never forgetti