Cankle Butt 

When your butt displays the same properties as your cankles. Aka fat ass

That chick was twerking and bumped into a greyhound bus causing it to roll over with all that cankle butt

Cankle Butt by Twin Brother Darkness May 24, 2016

butt cankles 

Tbe area under a fat chicks butt that looks like another butt.

the Kardashian sisters have butt cankles.

butt cankles by 3388djc June 25, 2012