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.
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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