Stone Cold calls it the Stunner, Disco Inferno has the Chartbuster, and the Disciple does the Apocalypse. They're all basically the same, and it's a pretty cool move. Oh yeah, it's also very similar to the Jaw Jacker.
1. Standing face to face with your opponent, turn and grab the
back of his neck with both hands (he should be facing your back
now).
2. Pull his neck down against your right shoulder.
3. Drop to your butt.
*A lot of the time, Stone Cold kicks his opponent in the stomach before applying the Stunner.