Dialect, identity, and power: Text 3: Paul and Khalil

1. All of it.
2. Yes, young American youths who don't like spelling or grammar
3. It was by Soulja Boy Tell'em, a young rapper, not really for anyone specifically but just as part of the new 'show rap' for lack of a better term genre.  It was marketed at young people who are 'cool', 'hood', and just like the sound of music that's words don't mean much.
4. It goes with a significant community of young people, but against what most older people feel is appropriate lyrics or topics for a song.