The Bomba is a powerful weapon in BMO's game, Guardians of Sunshine in the episode "Guardians Of Sunshine." When playing the game, Finn always uses the Bomba to kill Honey Bunny, but when Finn and Jake go inside of the game, they are unable to use it because they don't have a controller to select it. They end up escaping the game because Jake tries to grab the Bomba anyway, and ends up crashing the game. The Bomba is basically a bomb, it's just a little bit different, because when the Bomba hits something, the thing just discentigrates, unlike a bomb, which explodes on impact.
The bomba is a pixelated bomb. It is in a shape of an old fashion bomb with a rope-like fuse.