Chubby Checker is in a “Twist” (!) that his name is associated with an app called “The Chubby Checker” claims to predict the girth of a man’s penis based on his shoe size.

The singer (real name Ernest Evans) filed a trademark infringement lawsuit against the makers of the app, Hewlett Packard and Palm, Inc. and is seeking $500 million in damages.

“The Chubby Checker” is no longer available, but according to USA Today, an old description of the app read, “Any of you ladies out there just start seeing someone new and wondering what the size of there member is. Well now you can right now from your phone.”

The description continues, “All you need to do is find out the man’s shoe size and plug it in and don’t worry where your from because The Chubby Checker supports shoe measurements of different regions and types.”

Evans’ lawyers claim that the app infringed on his name, which he trademarked in 1977 and that his association with a penis predicting app will “blur and tarnish” his squeaky clean image.

“He’s hurt,” Evans’ lawyer Willie Gary told The Associated Press. “He worked hard to build his name and reputation over the years.”

Here is a video of Chubby Checker doing “the hottest dance sensation in the last four years,” as of 1960:

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