[Duke Castile]

It means she's outwardly embracing a stance that disguises her true nature. Chances are good that she's insecure as petertp said and is shit testing you as Luckystar said. You laugh at these chicks and ask them if you can make that their nickname. Or say, "is it cool if I just put that as your name in my phone"? to check them a little. I think these girls are wildly susceptable to game because they basically have a bully mentality, and as we know, if you check a bully they will crumble. She will love you for dismissively telling her that if she's going to be a bitch, could she at least be original with the way she acts like one.