Top definition
A vagina that is the size of a McDonnalds double cheese burger. It carries so much filth around it is like the burger with all the extra garnish and sauces like mayo, gherkins and onions.
The girl I slept with last night had such a McFanny on her!
by Britannia Gingero and co. October 23, 2010
Get the mug
Get a McFanny mug for your sister Sarah.