1. The removal of a subject's head; a beheading.
EX. When I see this .gif, all I can hear is Eddie Riggs from very underrated Double Fine & Tim Schafer game, Brutal Legend, shouting "DECAPITATION!"
If you're a fan of heavy metal, Jack Black, and/or a totally unique open world hack-n-slash, vehicle-driving, RTS game, you should definitely check out Brutal Legend and try and snag it during a Steam Sale or at your local electronics store's discount bin.