WHO IS NICK NAMED PRECIOUS

I don't recall this nickname from the book.

Since in the book right after it says "May I please speak with precious?" it then says "Now I understand why JB's taking his second shower this morning when he barely takes ONE most school mornings.", I am predicting that it is Miss Sweet Tea, JB's girlfriend. Also, in the chapter named When we get to the court, it states "I'm busy looking over at the swings where Jordan and Miss Sweet Tea are talking and holding hands." This is evidence as well for my statement.