Buu Body Attacks
From Dragon Ball Wiki, the ''Dragon Ball'' encyclopedia
This is when Super Buu turns into liquid and jumps inside the victims body, their body then explodes. He first used this technique against an assassins assistant (The one who shot his dog) and in the Anime Only he used this technique on Super Vegetto only to have Vegetto use his Ki to bottle him up, forcing Buu to evacuate from Vegetto's body.