The ugly stepsister to the cankle. When someone's ankle is so fat that it rolls over their shoes. Kinda like a fat ladies fat rolls over the top of her pants.
Damn, that dudes cankles have gotten so fat they have evolved into the elusive FANKLE!
A face cankle. A face that is so fat that there is no definition between the chin/jaw and the neck. Similar to where the calf meets the ankle but ends up being a cankle due to the fact that there is no defining spot where the calf changes to ankle.
my face is an example. i keep a beard so that people can distinguish my jawline as i have a fankle