dad: now that the kids are back, we can't walk around the house naked anymore  mom: too bad we got ourselves a boomerang kid
people that move out of their parent's house but decides to come back to live at home, in order to save money for travel, a new house etc
"dad: now that the kids are back, we can't walk around the house naked anymore  mom: too bad we got ourselves a boomerang kid" What is the definition of "boomerang kid"?