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An nice, plump backside that's ripe for spanking or anal penetration. Most clearly defined as an ass big enough to hold a cocktail or libation similar to a shelf ass.
Jane has a great Willum Ass, I know this because an ass becomes good when I can rest my beer on her ass when she's standing up.
by George January 19, 2005
11 5

Words related to Willum Ass

shelf ass