boomerang baby
n.— «The United Kingdom calls them kippers, short for “Kids in Parents’ Pockets Eroding Retirement Savings.” The United States refers to them as “boomerang babies.” And this year, 64 percent of 2004’s college graduates in the United States join the ranks of adult children returning to live at home» —“When children come home to roost” by Marshall Loeb Daily News (New York City) July 9, 2004. (source: Double-Tongued Dictionary)
Further reading
Sean in Oneonta, New York, says that when he was growing up in New Jersey, his family would pile in the car and set off on a surprise adventure, whether a short distance or long, and the kids would be told only that they were going on Buxtehude...
Penny in Savannah, Georgia, recalls that her father, a Navy veteran who served in the South Pacific, would say of someone who was clueless or didn’t know what he was talking about: That person doesn’t know if he’s punched, bored...