Double Dash!!

The Double Dash!! (or just Double Dash without the exclamation marks) is a move that can be performed only in the co-op play mode of Mario Kart: Double Dash!!. Before the race starts, when Lakitu counts down, both players must press A at the same time until Lakitu counts to one and then both players must release the A button and press it again to perform this move which will make the kart be launched at a higher speed than a normal Rocket Start.

Trivia

 * The name of the move is also present in the title of the game it appears in.