This is like a continuation of strafe jumping. Useful for turning corners without losing all your speed/momentum.
As you approach a corner (and while in the air in between jumps for strafe jumping) - crouch. When you hit the ground crouching, you'll "slide" for a brief moment which allows you to change directions and then release crouch and then jump at same time in the new direction. Takes some practice, but it can save some speed.
For those of you who have played Mario Kart on the 64 or SNES, it is very similiar to the "jump drifting" that you would perform by using the left shoulder or right shoulder buttons.
Tones