The Rocket Start(sometimes called the Turbo Start or Boost Start) is a move that can be found in all of the Mario Kart games. The players will get a short boost at the start of the race. It can be executed by pressing the acceleration button to the tune of the starting lights. When done wrong, it will make the kart falter.
 Other Appearances
Outside of the Mario Kart Series, it would also appear in a few other games. It would appear first in Super Mario Galaxy when in a race with Cosmic Mario at the start of each race. It will allow Mario to run very fast and glow yellow for a small period of time. Mario will need to hold the analog stick up on the nunchuck while the countdown starts. Then press Z when the timer hits 2 and then press A when the word GO! appears.
Next it would be in Mario & Sonic at the Olympic Games. where racers in the "track" event can perform a start dash at the start of a race. It would return in Mario & Sonic at the Olympic Winter Games on certain events.