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Somebody who is pretty fat, but their ass outranks their belly.
Fat person: " Hey,can you slide your chair in a little bit so I can get by?"

man sitting in chair: "Walk around the other way, Tub ass!"
by truckintim87 May 12, 2009
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An individual whose ass looks like the end of a tub (basically an ass that sticks the fuck out).
That kid has a tubass. Look at how his shirt scrunches over his ass.
by Desi Master September 21, 2005
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