Rapper or completely random black person appearing in a pop song in order to give white artists a false sense of street cred
"I be her backup black" - original lyric in Rebecca Black's "Friday" (seriously it fits right into that rap)
"Yeah (rapper X) is the backup black on that song"
See other Ark Music Factory creations - Alana Lee "Butterflies"
Justin Bieber "Baby" feat. Ludacris
Justin "I'm black on the inside" Timberlake "Chop Me Up" feat. Three 6 Mafia
Britney Spears "(I Got That) Boom Boom" feat. Yin Yang Twins
Christina Aguilera "Dirrty" feat. Redman
Big Time Rush "Boyfriend" feat. Snoop Dogg