Big Bang Kamehameha

Big Bang Kamehameha (ビックバンかめはめ波) is a combination of Goku's Kamehameha and Vegeta's Big Bang Attack used by Gogeta.

Overview
First, the user puts both of his hands in front of him, palms open and hands turned up at approximately a 90 degree angle. Then, he fuses together the tremendous energy of the Super Kamehameha into a Big Bang Attack that explodes into an extremely powerful stream of ki.

Vegito uses an attack similar to the Big Bang Kamehameha during his battle against Super Buu.[4] The attack is powerful enough to destroy Super Buu's left arm, part of his antenna, and the bottom half of his body. However, Super Buu manages to regenerate from the damage he received and continues the fight with Vegito.

Super Saiyan 4 Gogeta uses the Big Bang Kamehameha during his battle against Omega Shenron, the product of Syn Shenron's absorption of the seven Dragon Balls. After reversing Omega Shenron's Negative Karma Ball into a positive blue energy sphere to dispel the veil of negative energy covering the Earth, Gogeta declares that he has only one more task to perform. He then fires the Big Bang Kamehameha at the Shadow Dragon, seemingly killing him. However, Omega survives, but in his Syn Shenron form; the force of the attack has caused him to regurgitate all but one of the Dragon Balls. Sensing victory, Gogeta tries to use the Big Bang Kamehameha again to finish off Syn Shenron, but because of the tremendous power he possesses (and because Gogeta plays around too much during the ten minutes of fusion), he defuses back into Goku and Vegeta before he can launch the finishing blow.