First, Piccolo yells out "Die!" as he charges at the opponent and elbows them in their stomach before kicking them up into the air. Then, he flies after the opponent and double axe-handle punches them down to the ground, where he teleports beside them and grabs their arm. Finally, Piccolo says "I'll beat you to death!" as he punches the opponent in their stomach and throws them in the air before blasting them with a yellow Mouth Energy Wave, inflicting a huge amount of damage.
Piccolo appears to use the Mouth Energy Wave part of this attack during his battle with Goku at the 23rd World Martial Arts Tournament.
Piccolo uses part of this attack against the last remaining Saibaman. Krillin succeeds in killing three of the last four Saibamen with his Scattering Bullet, but one secretly escapes and hides behind a mountain. The Saibaman attempts to attack Gohan, but Piccolo grabs the Saibaman and attacks it with the Explosive Breath Cannon rush's throw and mouth beam, obliterating the creature. Piccolo also uses this rush attack against a Bio-Man, and after uses part of it against Dr. Wheelo in the movie Dragon Ball Z: The World's Strongest.
Video Game Appearances
The technique is named Bakuretsu Mahoko in Dragon Ball Z: Budokai Tenkaichi 3, where it is one of Piccolo (Early)'s Blast 2 attacks. In the Raging Blast series and Dragon Ball Z: Ultimate Tenkaichi, the technique's name was changed to "Explosive Breath Cannon" and the first three hits were removed. In Dragon Ball Z: Shin Budokai - Another Road and Dragon Ball Z: Burst Limit, the name of this attack is Demon Gun.