rap song played on video music box

sit back relax while i teach the class have'nt you heard a hard head means a soft ------sit up straight jailbait pay attention or get sent to detention(in the video its a classrom and the rapper is the teacher--then the young boy he was talking to replies)man i pay attention when i want to fat back slack i pay attention to the man on the stret corner(the teach asks 'why's that?)cause he's making lots of dough...and the chorus is a lady singing with a reggae sound to it

Sorry, I need punctuation and paragraphs.

I cannot underatand what are the lyrics and what's your conversation