Double Dash!!

From the Super Mario Wiki

This article is about a move in Mario Kart: Double Dash!!. For information about the game itself, see here.

The Double Dash!! (or just Double Dash without the exclamation marks) is a move that can be performed only in the co-op play of Mario Kart: Double Dash!! Before the race starts, when Lakitu is counting down, if both players perform a Rocket Start at the same time, the kart will be launched at an even greater speed than a normal Rocket Start. The name of move also shares the name with the name of the game the move appears in.