When a penis has been in contact with water for an extended period of time, whether it be bathing, swimming etc. The penis then becomes shriveled and wrinkled to the point where it is a fraction of normal size.
Im soaked. And im pretty sure I have Shrivel-Dick Syndrome

I better get out of the pool before I get Shrivel-Dick Syndrome
by Anamethathasnotbeenused March 31, 2011
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