Waffle Ass is a term used to refer to a womans posterior after it has been spanked enough times in any given direction to leave the imprints resembling that of a waffle.
"Girl, I'll spank yo ass so many times you'll have waffle ass for a week."
or
"I was diggin this chick 'til i saw she had been waffle assed by some dude minutes prior to our date."
A common occurrence inside penitentiaries. When one inmate presses his shaved butt cheeks against the grate of a SHU recreation cage, while his homeboy in the next cage sticks his meat shank through said grate and proceeds to beat those shit cakes.
If Harris doesn’t bust soon, Unique is gonna have Waffle Ass for a week!