Used to mean many things:
it can be as inappropriate as you want it, it can be used jokingly or seriously,
or simply, someone can go chew on your shoe...
your pick,

An incredibly good series by Stephenie Meyer, the books include (in order) Twilight, New Moon, Eclipse, and Breaking Dawn. The main characters are Edward Cullen, Bella Swan, and Jacob Black. I don't want to give away the whole series, so just give it a chance and read the books to find out more