English to Spanish Other General / Conversation / Greetings / Letters Talking between two friends

It is a way of saying hello between two friends. I do not have more context, I think it is an informal way of speaking among friends, maybe. One of the girls says JD and the other answers BD. JD could mean that the girl studies jura but I am not sure. It is a translation for a Turkish TV show. If someone could help me, I would be very pleased.
Thanks in advance.