Drift

From the Super Mario Wiki

Drifting (also referred to as Power Sliding) is a move in the Mario Kart series, allowing the kart to keep speed around corners, at a cost of a bit of handling. Beginning with Mario Kart 64, it is possible to use both directions of the D-Pad (left and right) simultaniously while in a drift to cause the kart to get a short, but helpful Mini-Turbo when the drift is ended. In most Mario Kart games, the player had to hop before being able to drift. This was, however, not the case in Mario Kart: Double Dash!!.

A special technique allows the player to get multiple Mini-Turbos in a single corner.