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

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