Kiss of Death

Kiss of Death has three (main) meanings within the world of organised crime.

Definitions

 * 1) A sign given by either a don or underboss that signifies that a particular member of the gang will betray them.
 * 2) A nickname for a Lipstick Pistol.
 * 3) A kiss given by a seductress to a traitor or rival mobster, usually moments before the assassination takes place.

Trivia

 * There are other definitions though the above three are the most common.