Double underhook powerbomb, also known as Tiger Driver, Tiger Bomb and Butterfly powerbomb, is an Powerbomb variation. The wrestler puts their opponent's head between their legs, underhooks both of their arms, lifts them into the air, flip them over and powerbomb them into the mat.
The name Tiger Driver was given by Mitsuharu Misawa, who innovated the move, though through time it also became known as Tiger Bomb due to it resembling a powerbomb more than a piledriver.
Misawa always delivered the move while landing in a sitout position, but like with most powerbombs, there are also standing, kneeling and falling variations.
A variation of the move sees the wrestler skip the first step and deliver the move from a position similar to that of a Butterfly suplex.
Another variation, called Tiger Driver '91, sees the wrestler land on their knees while driving the opponent's neck and head into the mat, similarly to a Ganso bomb. This variation was innovated by Jaguar Yokota and was also used by Misawa, who named the move after the year in which he first performed it.
The name Tiger Driver can also refer to the Double underhook piledriver.