an actual deficiancy in which a man has an abnormally small penis. Also called microphallus.
Coach: Aight boys, hit the showers.
Billy: ...Do we have to?
Coach: Of course you do. What are you so ashamed of?
Coach: HAHA! GUYS CHECK THIS OUT! BILLY'S GOT A MICROPENIS! IT'S LIKE AN INCH AND A HALF LONG! NO JOKE!!!