It *isn't* as thick as the "CANKLE", but it's not a skinny ankle. When you have thankles, you still have ankle-like definition unlike cankles when your calves run straight into your foot and you do NOT have an ankle or any ankle-like definition.
In order of skinniness, you have ankles, thankles, cankles
"Look at those girls thick ass ankles!"
"DAMN! Those be some thankles!"