From Dragon Ball Encyclopedia
Fat Boo crosses his arms across his chest and charges a vibrating pink energy sphere around his body. Next, he looks up and shouts, "Big power!" with the voices of both Fat Boo and Evil Boo. Finally, Fat Boo unleashes an explosion of pink energy across an incredibly wide range, destroying everything caught in its path.
Dragon Ball Z
Most times after this use, Fat Boo used the Angry Explosion more like an Exploding Wave rather than a Super Explosive Wave. Fat Boo used it to blow up entire cities by just lifting his arms and shouting, "Buu go bang, bang!".
It was Fat Boo's ultimate attack.
It is named Zenshin Kara no Shōgekiha (全身 から の 衝撃波, Zenshin Kara no Shōgekiha) in Dragon Ball: Daizenshū 7.