Footstool Jump

From the Super Mario Wiki
Yoshi using the Footstool Jump on Wario in Super Smash Bros. Brawl
Mario and Princess Peach Footstool Jumping in Super Smash Bros. for Wii U

The Footstool Jump is a move in Super Smash Bros. Brawl, Super Smash Bros. for Nintendo 3DS / Wii U, and Super Smash Bros. Ultimate that is executed by having the character jump while just above an opponent's head, and can be done up to five times consecutively before landing. The move allows for characters to meteor smash their opponent downward while using them as a spring.