A penis so large that when you take one look at it you become so frightened that you turn into stone.
If your dick had elephantiasis.

This past weekend I was totally gonna hook up with this guy from work but he had medusa dick. MEDUSA DIIIIIIIICCCCKK!!

This is one term you don't get to use that often.
by Mimi Bush April 10, 2014
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When you let your pubic hairs get longer than your flaccid penis
Go shave your pubes before you get Medusa dick
by RudeMikie February 13, 2017
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