F.L.U.D.D. is Mario's Up Special Move in Super Smash Bros. Mania. Pressing the attack button will allow Mario to take out F.L.U.D.D. and strap him on really quickly. Holding the combo (B+Up) will charge F.L.U.D.D. and the combo will use the move, sending Mario straight upwards, for a limited time.
Nintendo GameCube - Super Mario Sunshine (2002)