From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
The Final Explosion (ファイナル エクスプロージョン, Fainaru Ekusupurōjon) is an offensive technique used against Majin Buu as a last resort by Vegeta in his Majin form. After bidding farewell to his family, as well as Goku and Goten, Vegeta released his entire energy and life force in a deafening scream, which causes an enormous, devastating golden-yellow explosion wave. In addition to turning his body into stone, this attack was able to destroy most of Buu's body, leaving only confetti bits behind. However, due to Majin Buu's regeneration ability, it was able to reform its body, rendering Vegeta's explosion and sacrifice pointless.
Dragon Ball Z
Vegeta also used a scaled down version of the attack during the Vegeta Saga against Goku. In this variation, Vegeta did not lose his life. It is named Super Explosive Wave in the Budokai Tenkaichi video game series.
Dragon Ball GT
During the Shadow Dragon Saga, Goku attempted to use the same move to finish off Omega Shen Long, but was stopped under the prompting of Vegeta, who was ready to execute his plan to join Goku as a Super Saiyan 4.
Final Explosion is named in the Budokai video game series.
It also appeared in dbz:legendery super warriors and when used only one bar of life is left and also does a huge amount of damge to the opponent
It is named Ultimate Final Skill in official books.
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