From the Urban Dictionary:
Noun. A sight common among the morbidly obese. The point at which one is so obese that there is no thinning of the leg between the calf and the ankle, which creates a sense of fusion between the two. Consequently "Cankle" comes from the fusion of CAlf and aNKLE.In a sentence:
The latest American Godzilla has cankles (or kankles).