Steve- you may be correct as to the origin of the concept. The Turducken name, though, I'm fairly sure, is a late-20th century Yankee thing. No matter the origin, it's still an abomination. Kinda reminds me of one of the question cards from the Cards Against Humanity game:
"It is rumored that Vladimir Putin likes to eat _______ stuffed with _______". I've seen answers played including "The Pope" stuffed with "Altar boys", "Michael Jackson" stuffed with "the hopes and dreams of little children". Yes, it's a particularly evil game for sick and twisted minds.
Yes indeed the turd***** is an abomination, as if a store-bought turkey isn't inedible enough. The only dish I'd place below the turd***** is the tofurkey. Or anything from McDonald's