In baseball, a song that plays when a player for the home team walks to home plate to bat. Also commonly used when a new pitcher, especially a closer, enters the game. I don't know, I would pick something with a better beat for my walk-up song. Jack loves Chase Utley, so he also uses "Kashmir" as his walk-up song for our rec league team.
See also: song
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.