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A person who sits long periods of time on their ass causing it to widen and become platform like. It will take shape of the seat of the chair. More likely a fat person on welfare who has no life.
Jerry points out to his son Tom and says "Look at your mom sitting in the chair on the computer all day, I think she's developing Planter's Ass. "
by Browning802 February 10, 2017
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