A Buff is a strengthening of a character in Smash Bros. games. It is the opposite of Nerf. Many characters have been buffed from Super Smash Bros. Melee to Super Smash Bros. Brawl such as Bowser, Yoshi, and Luigi. Other characters have been buffed and nerfed. Lets say Bowser's Bowser Bomb has been buffed. That mean's Bowser's Bowser Bomb is more powerful than it was in the previous game.