Also known as ringtone rap. Mainstream rap music that's more about posturing and telling you to buy crap than it is about anything meaningful. The "gangsta" pose, combined with the barely coherent, often materialistic lyrics, makes the performers sound retarded.
Easily identified by repetitive choruses that take up most of the song, and the rapper's insistence that you buy some new fad object that you'll be embarrassed to own in five years (such as grills, or parachute pants).
Person #1: "Yo g-dizzle, I just picked up dat new Paul Wall CD!"
Person #2: "Get that retard rap shit the fuck outta my face!"