F.L.U.D.D.

F.L.U.D.D. is Mario's Down Special in Super Smash Bros. Battlers. Pressing down and the special button causes Mario to pull it out and charge it. Pressing down and the special button again will spray water which can be aimed mid-spray by pressing up or down. The spray will push enemies along with the water but does no damage

Origin:
F.L.U.D.D. is taken from Super Mario Sunshine for the Gamecube. Mario encounters the device at the beginning of his vacation and is then forced to use it to clean up the pollution on Isle Delphino. Although its main use is to wash away poisonous goo, F.L.U.D.D. doubles as a weapon and can be used to push small enemies away. If the water tank emptied, Mario is required to refill it in the nearest source of water.

Trophy Description:
A multifunction water cannon invented by Professor Elvin Gadd that Mario totes like a backpack. Since F.L.U.D.D. is able to converse with Mario, it's believed to be equipped with some kind of artificial intelligence. With special nozzles, F.L.U.D.D. can be used like a jet pack to reach high places or for high-speed swimming.
 * Super Mario Sunshine (2002)

Trivia:

 * F.L.U.D.D.'s Trophy Decription is taken from Brawl.