A Nananie

Someone who is typically the eldest sister of younger brothers and shows all the love and affection of a mother. She's usually psychotic and drinks vinegar like it's going out of style and asks the question "do you hate me?" every single day. Often treating others like her own kids, she will spank you and put you in time out whenever she pleases. Beware of Nananie.

Savannah: Hi Min, what did you eat today? How was school?
Kid: Youre such a Nananie