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What happens to ones ball sack on a hot steamy day. The ball sack becomes hot, wet and sticky. Like dipping balls in muck.
After running the race, tom had bad muck sack.

When Bill finished at the gym, he worked up a good sweat and had a bad case of muck sack.
by Ralphy Cakes October 15, 2007

Words related to muck sack

hot moist sticky sweaty warm