the ass of a person who's sole reason for existance is to be a life support systems for said ass.
an ass so large that if you tried to assram it your penis would not penetrate the rectum.
a person with a large ass.
Watch it tank ass, you'll break the chair.
A female with an gigantic rump. Usually an African-American....
Holy shit, did you see Tamika today? Dat bitch has got a tank ass.
A posterior so large, it is able to sustain the blow of an artillery shell.
Have you seen J-Lo's new video? Jesus christ she has got some kind of Tankass.
A fat angry man who has the same body composition of, and design as an M1A1 Abrams battle tank. Except without workable treads. Has sat on the same pillow for the past ten years, contact will cause pink eye.
Spends his time eating mostly TV dinners and small children.
Josh Fien is a Tank Ass.
Taking a shit with such force that your shit gets stuck to the back of the toilet.
Mann, I ate so much beans, I had tank ass all morning. I tanked so hard I almost ruptured a hemorroid!!!