A Big Booty Black Nigga is a very flamboyant homosexual man.
For one to be considered a BBBN you have to have an abnormal sized ASS as well as an abnormal sized penis (Extremely large or Extremely small). One must also be extremely buff. Race is not a limiting factor as to if one can be considered a BBBN.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.