A type of shot with the Sniper in Gears of War.
The "Hangman" was created by a user on Xbox live under the name "II HANGMAN"
The Hangman is the act of getting a headshot on an opponent while they are in the action of climbing over a piece of cover.
Sometimes combined with a "Backpack"
BLaacKeN: Blindfire Hangman across the map?
trevasco: Nahh. You fail.
BLaacKeN: OMG! GET HANGMANNED!!!