A penis that is a fairly good size when erect, but embarrassingly small when not.
I dont like to wear speedos because I have a shrinky dick.
by Jake1210 October 24, 2007
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Shrinky dick is a term used mostly by women to embarras men for having a small penis.
Guy: "Hey gurl!"

Girl: "Hey shrinky dick."
by The Whitest White Man Ever February 5, 2016
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