Egg Roll
Egg Roll is the side special move of Yoshi. The player can steer it by scrolling the control stick left or right, and stop the attack by pressing the special button again to break the egg. In Melee, it can be used to increase Yoshi's horizontal recovery. It is easily countered, but acts as an efficient way to pass an edgeguarder (when Yoshi is off-stage), but if the opponent can reach the egg's height and hit Yoshi it is essentially followed by a death. If preferred, the player controlling the move may wish to hold the special button. This makes it more difficult to control, but allows more damage.
In Brawl, Yoshi's air speed is decreased while using the Egg Roll, making it useless as a recovery move. Also, it is notoriously easy to self-destruct with Egg Roll in Brawl, as Yoshi becomes helpless if used in midair, and running off platforms with Egg Roll is easy.
Origin
The move seems to be unique to the Super Smash Bros. series, but may be based off of Yoshi's Story where upon eating a Turbo Tulip, Yoshi could encase himself into an egg and fling himself at enemies or out-of-reach objects. The Egg Roll would later appear in Mario Power Tennis and Mario Strikers Charged.