A name, typically paired with another mildly offensive word, given to someone who you and your friends dislike. The primary reason for assigning a Deltrese nickname is so it's possible to talk shit about them whether their listening to your conversation or not.
Brianna: There goes Dusty Deltrese again; when will she ever start wearing normal clothes?
Kaleb: I don't know girl. I just don't know.
Dusty Deltrese: Who's Dusty Deltrese?
Brianna: Oh, don't worry about it. You don't know them.