Eminem, "Square Dance" and The Dirty South

So I've read a copious amount of reviews of Eminem's last album, and I've noticed that a considerable number of 'em link "Square Dance" to the Dirty South scene (Q, in its endearing cluelessness, said it sounds like "Nelly and Outkast"), which baffles me. I mean, are these writers just judging the record by looking at the song titles, or does saying "y'all" immediatley qualifies a track for "Dirty South Flava" status? I see no resemblance to Nappy Roots and Outkast whatsoever, but maybe I'm just missing out on something?

But then I noticed that I don't really know what a "Dirty South" track would sound like, anyway. I mean, I (heart) a lot of artists that reportedly fall under this genre, but I can't really see what unifies them musically. So is there anything, or is it just an image/attitude/geographical thang? Excuse My Ignorance...