And I was thrilled to know about Urdu in Tamilnadu. That perhaps is the last post of Urdu. I did not know about it. A Hyderabadi (non-Muslim) friend asked whether I have heard Tamilnadu Urdu. I had not. He said that it is very different. And it was. When I heard on Chennai Railway station a husband and wife taliking I knew it was not Tamil and I knew that it was Urdu but I could not pick up the gist!
I suppose when our friends from Tamilnadu speak to us in Urdu they use easy Urdu for our convenience.