Randy Orton attempting an RKO on John Cena.
The RKO is a variation of a cutter. This move sees the wrestler jumping towards the opponent and grabbing the opponent's head in a three-quarter facelock while parallel to the ground, and then slamming the opponent's face to the mat in a cutter.
The move was a slight variation of Diamond Dallas Page's Diamond Cutter; the move was innovated by James Harrison and entitled the TKO — a shortened version of the moves full name Total Knockout. When Harrison trained Randy Orton, he renamed it the RKO to match Orton's initials and Harrison renamed his version's name to Real Knockout. The move known as an RKO is only used by Orton and Harrison does use it but rarely since Orton debuted.