Mystic Ball Attack
From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
First, the user curls himself up in a ball, and launches himself at his opponent, knocking them away. Then, they fly away and charge back to knock into the opponent several times. Finally, the user flies high up into the air and charges downward to knock the opponent into the ground, inflicting a great deal of damage.
Dragon Ball Z
Super Boo first used this attack in his battle against Gotenks in his Super Saiyan 3 form. When fighting Gotenks on Earth, Super Boo caught and blasted Gotenks straight up into the air, destroying half of Kami's Lookout (which left Piccolo greatly shocked and upset). Super Boo flew up at the partly destroyed Lookout and attacked Gotenks and Piccolo with the Mystic Ball Attack, destroying the entire Lookout in the process. Gotenks eventually caught the attacking Super Boo with his Charging Ultra Buu Buu Volleyball attack, transforming Super Buu into a volleyball and smacking him down into the Earth.
Super Boo later used this attack during his battle against Gohan in his ultimate form. When Super Boo fired the Gack! at Gohan, the Saiyan easily deflected it, allowing Super Boo to attack Gohan with the Mystic Ball Attack. However, Gohan managed to catch Super Buu, only to be driven into a mountain.
Kid Boo Saga
Kid Boo used this attack during his battle with Son Goku in his Super Saiyan 3 form on the Supreme Kai Planet. After Goku knocked down Kid Buu with a double-axe handle punch, Kid Boo wrapped himself in a ball and attacked Goku with the Mystic Ball Attack, hitting the Saiyan point-blank in the face. Goku flew away from the pursuing Kid Buu and lured him onto the ground before getting out of the way, crashing the Majin deep into the ground.
Kid Boo can also use a one-armed version of the Mystic Ball Attack. Kid Buu tears off his arm and forms it into a ball. Then, he launches the arm ball at the opponent, knocking them away. Finally, Kid Buu directs the arm ball to knock into the opponent several times with telekinesis. He used this attack while fighting against the good Majin Boo, battering him around.
Mystic Ball Attack is named in Dragon Ball: Raging Blast and is one of Super Buu and Kid Buu's Super Attacks. The attack is named “Mystic Combination” in Dragon Ball Z: Budokai Tenkaichi 3. In this game, it is one of Kid Buu’s Blast 2 attacks and is performed differently, as Kid Buu uses teleportation and kicks at the end of the rush.