Would you believe the Urban Dictionary has an entry for PZ? It’s lousy—I can’t believe anyone uses the term that way, and I can’t imagine how they pronounce it. And pzizzle isn’t any better.
Myers, at least, has some punch to it: “Last name of any various white masked knife weilding bad muther *uckers.” I still think most of these entries are jokes sent in by people, especially when the spelling and grammar are atrocious, and that they don’t really have any common usage.