Purple People Eater

I recently heard the song "purple people eater" by Sheb Wooley.

After listening to it a question comes to mind, a conundrum if you will.... "Is the people eater itself actually purple?...or...Does it only feed on purple people?"

I have a theory on this subject...but would love to hear what others think as well.

If you haven't heard the song below is a link to a cover performed by Milkman Alice:

Purple People Eater

Thanks!