Boo Body Attacks
From Dragon Ball Encyclopedia
This is when Super Boo 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 Vegerot only to have Vegerot use his Ki to bottle him up, forcing Boo to evacuate from Vegerot's body.