With the incomplete technique, Goku creates a ki orb, splits it two and twirls them around his body.
With the complete version, the ki orbs are much larger.
Video Game Appearances
In Super Dragon Ball Heroes: World Mission, it is localized as Dancing Twin Dragon Blast where it appears as the Super Attack for God-like Saiyan Goku (Prison Planet Saga). It also has a Super Attack Accessory though it is called Twin Dragon Blast and its description refers to the technique as Supreme Dragon Blast but when the Accessory is equipped to a card, the technique is listed as Dancing Twin Dragon Blast in the card's Super Attack slot.