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For this tweak to work you must have a Jailbroken idevice running IOS 6 or better.
All you have to do is go to Cydia on your Ipod touch 4th or 5th Generation or Iphone.
Then go to - search package names and descriptions.
Search for Harlem Shake. Free from BigBoss dev. Install it.
This App will also download another tweak called Activator which allows you to set up Gestures and shortcut for lots of different actions on your Idevice.
For example, Make your Icons Dance by tapping 3 times on the home screen or by tapping on the status bar.
Activator can be found under your settings menu and can be used with or with without this app.
Definitely an awesome app worth getting to show off to your friends and family.