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In baseball, a walk-off home run is a home run that ends the game. It must be a home run that gives the home team the lead (and consequently, the win) in the bottom of the final inning of the game. Thus the home team can walk off the field immediately afterward, rather than finishing the inning. The winning runs must still be counted at home plate.
So called because the losing team (usually the visiting team) then has to walk off the field. The term walk-off can also be applied to any situation with two outs or less in the last at-bat of the home team (such as the walk-off single, wild pitch, etc.) where the game ends as the winning run scores.