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!!!
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A very large and substancial glutious maximus. Like a tank is to a car -- a Tank Ass.
"Look at that softball player, she has a Tank Ass."
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A lady's ass that is so flat and wide that it resembles a tank like structure. If she layed down you can use that tank ass for a table.
Slut bend over so i can ram rod your tank ass then eat some butt
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Ass with marks left from sitting on the tank (toilet) for too long
John-"Dude, you've got tank ass!"
Bruce-"WHY THE F*CK ARE YOU IN MY BATHROOM?!"
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An ass so large that is causes the bearer to commonly be late to work.
Can you believe that tank ass Craig was late again!?!
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ass-tanking is when you put your index finger in your crack, just like you do at the gas station with gasoline gun. then, you keep it there until the finger is "ripe" and ready. after you smell it. the longer you tank, the more enjoyable it is.
ass-tanking is a nice, free hobby.
Generally, a wide, thick butt that doesn't have reasonable curvature (A.K.A. bubble butt) or shapely definition.
A large butt that lacks roundness (may be flat in places), although it may have depth, and a shelf.
My girl gained a bit of weight after the baby, and it all went to her hips. Her booty used to be round, but now it's more of a tank ass now.