When there is no ankle, there is just a leg that goes into a shoe, or there may be a crease like a tournaket where the ankle should be. Calf-to-foot.
he is so fat he has Cankles
A leg with no clear definition of where the calf ends and the ankle begins
First kid in food court - "Dude, look at the canckles on that mall rat..."
Second kid in food court - "Shut up dumbass! I'm trying to eat!!"