Hello, It's taken from an American TV series taking place in New York. a girl (A) interrupts a girl friend of her (B) having a kind of argument with her boyfriend (B's boyfriend) (basically, B tells her boyfriend that he is being too sweet and that she would like him to not give a shit about her). The boyfriend then leaves the room saying "Have a good day, ladies. I mean, sluts." and telling A she's a slut. A to B: What? B to A: I'm sorry about him. A to B: No sweat off my back. What's going on? Does it mean she doesn't care but wants to know whats' happening? Thank you for your help!