The Miracle Super Punch (ミラクルスーパーパンチ) is a physical attack used by Gotenks. Despite Gotenks naming the punch and treating it as special attack, the punch along with its effect seem pretty basic, just like an average punch.
Gotenks uses this technique against Super Buu during their battle in the Hyperbolic Time Chamber. It is one of his continuous stream of attacks where he unleashed punches and kicks. Immediately after using the Power Tackle, Gotenks punches Buu in the face with the Miracle Super Punch. He continues with the Great Kick Special and other attacks afterwards.