Tilting is a special move a car can perform in the games.
Tilting will make the car lift up and drive on only two wheels. They will start turning extremely sharply, but it will instantly make them start losing speed. It can also be performed while driving straight, but this is highly discouraged as it will reduce control and speed, although they tried to make it benefitial by having it fill the player's boost in Cars 2: The Video Game.
Competitive Use Edit
The best way to use this move is when in a situation where the car is bound to wipe out unless able to turn quickly, and rather than to hold tilt, it is better to repeatedly tap the tilt button, so the car can immediately turn, but at the same time, will not lose as much speed.