An intimate knowledge of rap

On the light rail last night there were two guys behind me both listening to hip-hop, one leaned over to the other and read him some lyrics off his phone and after every two bars or so the other would say,
          "Now to the uninitiated they would hear these lyrics and would be like 'Damn man! Are you on drugs? Are you smoking something?' but with my intimate knowledge of rap...I know exactly what he is saying."
He said this no less than three times, with minor variations on the theme:
         'To someone who doesn't know rap this would be meaningless, but I have an intimate knowledge of rap terminology and understand what he is saying completely."