Whirling Fortress

The Whirling Fortress is an attack used in the Super Smash Bros. series, originating in the GameCube title Super Smash Bros. Melee and later on appearing in Super Smash Bros. Brawll, where Bowser would perform the attack by pressing down B. When the player doing so pressed the correct combination, Bowser would, if on the ground, jump up in the air then perform a ground pound. If he was already in the air, then he would simply do a ground pound without going farther up.

The move is probably a reference to the attack that Bowser could perform Super Mario Bros. 3 for the NES in the last level, in which he would attempt to ground pound Mario or Luigi.