" great-aunt "

 [ "great-aunt" ]

1: Grandparent's sister.

  * e.g.,  ... My great-aunt is a good person. 

 [ "great-aunt-in-law" ]

1:  The wife of one's grandparent's brother.

  * e.g.,  ... My great-aunt-in-law is a good person. 

 [ "great-aunt-in-law" ]

2:  The sister of one's grandparent-in-law.

 [ "my great aunt fanny" ]

1: fanny is a euphemism for the buttocks. So the exclamation "My Aunt Fanny!" or "My great Aunt Fanny!" is to say

  * e.g.,  ... "I think YOU dented my car." (surprise and denial) "My great Aunt Fanny! I did not!" 

 [ "my great aunt fanny" ]

2: "My ass!" as something of a perturbed rebuttal or reply

 [ "co-great-aunt-in-law" ]

1: The wife of one's grandparent-in-law's brother.

  * e.g.,  ... My co-great-aunt-in-law is a good person. 

 [ "Your face's second mother's daughter's great aunt's cousin's divorced wife's baka usagi of a roommate" ]

1: 'Nuff said. Pretty much the same as your face or your mom. Can be used for any type of situational comeback that you can possibly think of with a touch of...elongated flair.

  * e.g.,  ... Person 1: You don't look so good. 

 [ "second great-great-cousin-aunt" ]

1: Great-grandparent's female second cousin.

  * e.g.,  ... My second great-great-cousin-aunt is a good person. 

 [ "first great-great-great-cousin-aunt" ]

1: Great-great-grandparent's female first cousin.

  * e.g.,  ... My first great-great-great-cousin-aunt is a good person. 

 [ "sesqui-first great-cousin-aunt" ]

1: Daughter of their great-grandparent’s half-sibling with the other great-grandparent’s full sibling.

  * e.g.,  ... My sesqui-first great-cousin-aunt is a good person. 

 [ "great-aunt" ]

1: Grandparent's sister.

  * e.g.,  ... great-aunt. 

 [ "half-great-cousin-aunt" ]

1: Grandparent’s female half-first cousin.

  * e.g.,  ... My half-great-cousin-aunt is a good person.