Bob-ombast is a special move used by Admiral Bobbery in the game Paper Mario: The Thousand-Year Door. It can be used once Bobbery reaches the Ultra Rank and costs 9 FP to use making it the most expensive move to use in the game.
To use Bob-ombast, the player must rapidly press to fill up the gauge. Bobbery will slowly walk toward the enemies and if the gauge is filled all the way, Bobbery will explode dealing 8 points of damage to all enemies. This makes Bob-ombast the most powerful move in the game out of Mario's partners. However, due to it costing so much FP to use, it should be used sparingly.