The "boomerang generation" is when an adult moves back home with parents for a period of time. Often this could be young adults who have just finished school and aren't quite sure about the direction of their future. It could also be adults who are having trouble affording rent or housing in the city, but it does not necessarily mean that the adult is not working or trying to get an education. So the boomerang generation are grown-ups who, for various reasons, decide to move back home with their parents to help them get back on their feet and prepare for the future.