F.L.U.D.D.

F.L.U.D.D., known in Japan as Pump (ポンプ, "Ponpu"), was 's side special move in Super Smash Flash 2. The move worked very different from its Brawl counterpart, it was more of an offensive move than a defensive move. Mario pulled out the water cannon F.L.U.D.D. to release a charge of water that launches himself forward striking everything in his path. The move was unable to be charged in the first ever playable demo, but this feature was added in the following versions. If charged the attack was stronger and traveled faster, it could be used to either attack or recover. It was replaced by the move Cape in v0.2b of the demo. During that time, many suggestions in the Bug Reports suggested to take it back or to replace the Mario Tornado, to the Brawl's F.L.U.D.D. Another dropped concept for Mario's down special move was the F.L.U.D.D. Tornado, which was scrapped since the Mario's brawlifications, and was never used in currently demos.

Origin
The device F.L.U.U.D. originated from the game Super Mario Sunshine and was used throughout the majority of the game. Mario used F.L.U.U.D. to get rid of the pollution that was running rampant in Delfino Plaza. F.L.U.U.D. needed to be re-charged every so often and to recharge it, Mario had to go into a body of water to fill F.L.U.U.D. up. It's use in the main Super Smash Bros. games resembles the way Mario uses the device to spray enemies or clean up the area. The way it was used in SSF2 is not present in Sunshine, although it did give different recovery options for F.L.U.U.D. to use in the game.