The unexplainable excessive growth of a mentally challenged mans dong. An evolutionary trait brought about to make up for a lack of other senses and abilities.
Retard dong AKA the "rainmaker" is often seeked out by overbearing women with a strong desire to find purpose.
Toby is slow, but man can he fuck. He's got that retard dong.
by Manuterus May 13, 2015
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