Egg Roll
Egg Roll is a special move used by Yoshi. It is a smash B move. The exectuor can steer it by pressing left or right, and stop the attack by pressing B again. It can be used as a third jump, but in Brawl, it gets almost no distance at all. 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.
In Brawl, Yoshi's egg roll has higher priority. In fact, if it collides with a falcon punch, the two moves will cancel each other.
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. A Similar technique would later appear in Mario Power Tennis and Mario Strikers Charged.