That's easy, that's if you have a car, with manual gear

It can only be done when you are on the freeway

When at high speed and you are in the 4th/5th gear, you press down the clutch and press the gear into "R" thereafter you lift your feed from the clutch, be beware that the speed may increase alot-you will be pressed back to your seat due to the G-force.

R stands for Rapid speed(or Warp drive)