WHAT DOES BAK MEAN ?

WHAT DOES BAK MEAN ?

I first thought (idk why) that it was just her playing with the word ‘back’ (since she’s back after giving birth). But now I think it’s something that is connected with her future project(s). The first letter (B) could stand for Beyoncé and the last letter (K) for Knowles?? We will see. It’s some kind of clue for something for sure.