Galick Gun (ギャリック砲, Gyarikku Hou, also "Garlic Cannon") is one of Vegeta's signature attacks, an energy wave similar to Kamehameha. It is capable of destroying large planets if enough power is put into it.
To utilize it, Vegeta curls his fingers and places both his hands together at chest level facing the same direction (so that the palm of one hand is on the back of the other). Then, once enough ki is gathered, he thrusts both hands forward to fire a powerful blast of energy. The result is a powerful, fuchsia-colored energy beam that emanates from his hands and body.
Vegeta first used this move against Goku in their first fight during the Saiyan Saga. When Goku countered the Galick Gun with a Kaio-ken x3 Kamehameha, Vegeta noted that the two skills are evenly matched. Eventually, Goku's Kamehameha outmatched it easily by using a quadruple Kaio-ken.
Much later, Semi-Perfect Cell used this attack against Vegeta in his Ascended Super Saiyan form, to no effect.
In Dragon Ball GT, Vegeta would used a blue colored version of the Galick Gun during his battle with Baby Gohan.
Also, in the video game Dragon Ball: Raging Blast, Vegeta has the attack in his what-if Super Saiyan 3 form, as an Ultimate Blast. Here, Vegeta uses his newly acquired Super Saiyan 3 powers to magnify the power of the Galick Gun to incredible heights, probably even more than a standard Big Bang Attack or Final Flash (where, in this game, these attacks are simple Blast 2 attacks in his Super Saiyan 3 form).
