auntie (n.)youdaoicibaDictYouDict[auntie 词源字典]
1787, also aunty, familiar diminutive form of aunt. As a form of kindly address to an older woman to whom one is not related, originally in southern U.S., of elderly slave women.
The negro no longer submits with grace to be called "uncle" or "auntie" as of yore. ["Harper's Magazine," October 1883]
[auntie etymology, auntie origin, 英语词源]