The U.S. is facing a new epidemic and it has nothing to do with obesity.
The twerking epidemic is sweeping the nation, after Miley Cyrus begin wildly shaking her booty in her "We Can't Stop" music video and during her VMA performance with Robin Thicke.
It unfortunately hit new levels on Wednesday when a leaked song featuring Cyrus, Justin Bieber and Lil Twist hit the web.
What's it called? You guessed it -- "Twerk."
There aren't many words that can justifiably describe the song -- you'll just have to listen for yourself.