Continuous Die-Die Missiles
From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
Gotenks shoots a yellow-colored Ki Blast multiple times at his opponent.
It was Gotenks' version of the Continuous Energy Bullet, but each blast was more powerful than a normal one. Aside from its increased potency, the extreme rapid fire made it hard to miss.
Dragon Ball Z
Gotenks used this attack in his fight against Hirudegarn's first form, but Hirudegarn simply transformed to block the blasts.