Ex-WWE Star Chyna -- Twerking Up a Storm ... And It's Not Good

This is not going to make twerking cool again -- in fact, former WWE star Chyna put the final nail in the dance craze's coffin.

Chyna dropped the video on her social media channels claiming one of her fans requested the twerk session ... and she was happy to oblige.

The only problem? Well, take a look ... think, mom from Orange County who just watched a Miley Cyrus music video.