black stage pass
When a white (Caucasian) person is friends with a black (African-American) person, and is able to do things, go to events, etc. in that person's company that he or she would be unable to do alone or with other white people.
Being able to refer to each other as "nigga" or "cracker" is an example of getting a black stage pass. Another example would a white person being able to get into the Apollo Theater or perhaps a spot on Soul Train.