1. Download the app.
2. Select one of the thousands of 10-second clips from movies, songs, tv shows, political speeches, etc. (Or upload your own sound bite.)
3. Use the app to video yourself dubbing the clip.
4. Immediately share with friends via text, Facebook, Twitter, or email!
If you still don't know why you would want this app, here's some motivation for you to go back to the App Store (like you need it).
At the very least I hope this gave you a few laughs :)