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the square feeling of your butt after you've been sitting in the same position for far too long.
Hillary: (gets up from chair she's been sitting in for hours) "Ow! I have spongebob syndrome!"

Kristina: "What's that?"

Hillary: "When you've been sitting the same way for too long, and when you get up your butt feels square."
by teeny0584 October 13, 2006
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