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when you do sport or when you are walking around town on a really hot day and your balls have been sweating so much that the sweat starts running down your legs making them rub together raw, you have soupy sack. To avoid soupy sack don't wear jeans on really hot days
Jesus its hot today, I should have worn shorts and now I have soupy sack.
by bigdevil86 October 20, 2011
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