Slap Leather Meaning

(US, idiomatic) To make a quick motion to draw one's handgun from its holster, especially in a duel in the Old West.

Example: 2001 Aug. 17, Stephen Hunter, "'American Outlaws': The Young And the West-less ," Washington Post (retrieved 7 July 2015):
  [T]he western . . . provides a ready armature for other dramas that have nothing to do with slapping leather, riding horseflesh or kissing purty gals.
2010, "Movies: Destry (1954)," New York Times (retrieved 7 July 2015):
  Murphy plays Tom Destry, the peace-loving son of a notorious gunslinger. . . . Though he prefers to talk rather than slap leather, Destry manages to keep the bad guys at bay.
2015 April 20, Kelly Bostian, "Quick-draw cowboys face off to find Oklahoma's fastest guns," Tulsa World (retrieved 7 July 2015):
  With .45s strapped to their sides, gunslingers—30 men, six women, even an 11-year-old kid—slogged through the mud in their cowboy boots to reach a dirt-caked boardwalk where, one after another, they slapped leather to see who would reign as Oklahoma’s fastest gun.