Just as the name implies. Ok, there's a bit more...
The app plays a gif and a repeating sound clip in the background. This was initially made just for playing the Batman on Drugs video (https://www.youtube.com/watch?v=e1dvSlvZLG8) when the user shook the phone. Features were added to the app to allow the user to play any gif or mp4 they downloaded on their phone so it is no longer limited to just this gif and mp4.
Still more room for improvement. Will probably work on it again for fun in the future.