Cankle ankle is a slang term that describes a lack of definition between the lower calf and ankle. It means that the bottom of the calves and the ankles blend together to appear as one. Cankles can occur due to genetics, whereby a person has a predisposition to store fat in the lower legs. They can also be caused by an accumulation of excess fat, the natural bone structure, muscular calves, swelling caused by a medical condition (edema), or genetics. Sometimes, the formation of cankles can signify the presence of a condition called chronic venous insufficiency. There are exercises and surgical procedures that can help reduce the appearance of cankles.