The act of being lame or lamo. Used to insult n00bs and g00ns when they show their lameness. Can also be used to curse a bad situation. Only 1337 haxx0rs are able to utilize this uberawesome word.
Popular mainstream rap - unlike hardcore rap, it's all about bling and chicks and makin' love and whatnot, usually delivered in smooth tones (for the laydeez) and is ultimately lame - to the core.
Did you check out his CD collection? It was all Usher and heaps of other slick, generic, vacuous lamecore rap and r'n'b.