Matt Gauthier explains how to do an Inverted Chest Roll.
A Chest Roll is when the frisbee rolls from one hand, down the arm, across the chest, and out the other arm and to the other hand. A Chest Roll is performed when facing the wind so that they wind will push the disc onto the chest.
An Inverted Chest Roll is performed with the back to the wind. However, the underside of the disc is still towards the wind. Bend backwards as far as possible to provide as much surface area as possible and to get the head out of the way. Then, do a chest roll.