I wrote a bunch of stuff but I am going to sit on it a while and try to edit it down a bit.
Starting with the highest knowledge first "Nigga please" is ebonics for disdainful incredulity. That is the whitest way that term has ever been defined! Here is a Chris Rock Parody on the term: http://youtube.com/watch?v=w1I_ozVln3w&mode=related&search=
