A choreographed slide is similar to a drift/power slide.

Let me explain the difference.

Drifting/power sliding is the act of breaking the back end of your vehicle loose and sliding sideways around a corner without losing any of your entry speed.

Choreographed slideing is the act of doing whatever it takes to make the drifting/power sliding look as cool as possible. Whether that means slowing down right before entering the drift/power slide, losing some of your entry speed to give you the control you need to increase your angle without spinning out or to do a burnout while you perform your drift/power slide.