Jody (n.)youdaoicibaDictYouDict[Jody 词源字典]
"civilian who is thought to be prospering back home with a soldier's sweetheart, wife, job, etc.," by 1979, said to date from World War II, from masc. proper name Jody, for no clear reason. Hence Jody call.[Jody etymology, Jody origin, 英语词源]