Super Glide is an ability that is a faster version of Glide that also allows you to travel farther.
It first appeared in Kingdom Hearts' in the End of the World after defeating Chernabog. You use it by pressing and holding it down while in the air. Then you move the left analog stick to fly in the air.
It does not reappear in Kingdom Hearts II, because the Glide ability can level up as you learn and level up Final Form.