* A nickname: Someone might be called "Aunt French" affectionately, perhaps because they have a French heritage or have a French-sounding name.
* A specific person: It could be the name of a person you know.
* A misunderstanding: You might have misheard or misinterpreted something.
Could you provide more context? For example:
* Where did you hear this term?
* What was the situation?
* What else was being discussed?
With more information, I might be able to help you understand what "Aunt French" refers to.