birdie (n.)youdaoicibaDictYouDict[birdie 词源字典]
"little bird," 1792, from bird (n.1) + -ie. As golf slang for "a hole played one under par," by 1908, perhaps from bird (n.) in American English slang sense of "exceptionally clever or accomplished person or thing" (1839).[birdie etymology, birdie origin, 英语词源]