Walk off home run

Answer 1

A walk-off home run is a home run that ends the game. It must be the run that gives the home team the lead in the final inning of the game.

Addition:

It is named such because after it is hit the defending team literally walks off the field as the game is over. This is a recent term in Baseball, however, has caught on well with people around the game and fans. Maybe other then a marvelous defensive play it is the most dramatic way to end a baseball game