Top Definition
An ass that although perfectly acceptable on an 18 year old, will inevitably fall prey to gigant-ass syndrome in a few more years. The outer limit of ass acceptability, where a mere inch makes the difference between fine and flabby.
She's no keeper, you best hit that now 'cause you know that Time bum's going off any day now.
by pegcityswimmer September 29, 2010

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