Although the concept of a game-ending home run is as old as baseball, the adjective walk-off attained widespread use only in the late 1990s and early 2000s.
According to web sites Dennis Eckersley did create the term walk off. THe same year he gave up the Kirk Gibson legendary walk off HR in the world series.
Amazingly enough, the term was never used until that point. Bobby Thomson, Bill Mazeroski, Chris Chambliss, Carlton Fisk, none of their legendary postseason home runs were referred to as “walk-off” home runs at the time.
Peter Gammons called it his “DialEck.”
A home run would be “taking the pitcher over the bridge.”
A pitcher who gave up a lot of home runs was a “bridgemaster.”
A very fast fastball “had a lot of hair on it.”
The first use of the term “walk-off” occurred on July 30, 1988, in the Gannett News Service: ”In Dennis Eckersley’s colorful vocabulary, a walkoff piece is a home run that wins the game and the pitcher walks off the mound.”
What’s fascinating about the original usage, of course, is that Eckersley meant for the word to have a negative connotation, not a positive one.
Less than three months later, though, the word that Eckersley coined was forever associated with a different, euphoric connotation. Now teams walk-off in celebration (in addition, the term itself has been bastardized a bit from the original meaning which was strictly referring to game-winning home runs and is now used to describe ANY game-winning hit that ends a game).
http://legendsrevealed.com/sports/2...endary-walk-off-home-run-in-the-world-series/