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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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.
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A female with an gigantic rump. Usually an African-American....
Holy shit, did you see Tamika today? Dat bitch has got a tank ass.
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Abnormally large buttocks typically found on outstanding Marine radio techs
Damn that Hafterson sure has a Tank Ass
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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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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.