http://www.snopes.com/horrors/cannibal/tapping.asp
You beat me to snopes.com! There have already been a couple of threads about this story.
I got that feeling as soon as I saw the words, "According to the website..."
Life does sometimes imitate art, and many an urban legend turned out to happen after it had made the rounds for years. However, the complete lack of names and dates, along with pinning the whole story on a Hungarian police magazine Web site (cops love to swap stories), leaves me to take it with a large grain of salt.