Here, for your enjoyment & education, is Matt Bilderback demonstrating an Overhand Wrist Flip. The first part of the video demonstrates the grip. In the second part, where he’s demonstrating the release, he shows a Blind Overhand Wrist Flip. A blind release for this particular grip is easier for the novice player. The Overhand Wrist Flip can also be thrown forward.
If you’re interested in seeing this grip thrown forward, check out this video. Mark Muir does an Overhand Wrist Flip under his leg at :15, and again at :25, and a more traditional release at :31. There are other examples throughout the video – can you identify them?