the part of the human body that is between the taint or durf and the asshole.
Please note that the fanchon is so small that you, for the most part, will not be able to see it........but it is there.
Damn! My fanchon is killing me! -or- I hurt my fanchon when I was riding my bike today.
Crazy poofy haired lady
"Damn! Did you see that Fanchon run by?!"
"I think Fanchon is on drugs"