Galaxy Dynamite (ギャラクシーダイナマイト) is an energy wave barrage used by Captain Ginyu. First, Captain Ginyu puts his hands to his sides and charges purple energy spheres. Then, he shouts, "You're mine!" as he puts his hands forward and fires multiple ki blasts at the opponent, inflicting a high amount of damage.
Captain Ginyu used this attack during his battle against Goku on Planet Namek. Irritated by Captain Ginyu's incessant laughter, Goku ordered Captain Ginyu to leave Planet Namek, but was forced to deflect Captain Ginyu's energy sphere attacks, to the captain’s amusement. Captain Ginyu decided to step things up a bit and attacked Goku with the Galaxy Dynamite, creating a huge explosion. However, as the smoke cleared, Goku was barely phased.
There is also another attack that Ginyu uses, where he fires a barrage of red/orange colored energy balls, these may or may not be a variation of the Galaxy Dynamite technique.