Unfortunately, I am not familiar with this expression. But as a native English speaker, I wanted to reply so that you knew you weren't alone!
Without more context, I have no clue either. I am confused. Does the gang leader have super, telepathic powers where he/she can talk with others? Can they read someone's mind? Perhaps the term, "mind-share," was mentioned earlier in the movie? It could be an expression specific to that movie and its characters.