I tried ignoring it. Then when that didn't work (and he started shouting "PENIS" in public), I tried the whole "Penis is a special word that you ONLY use in special times..." Well, that backfired in a major way. He started throwing it in randomly at the end of sentences. For example, he would say, "Can I wear my jeans today?...penis" or "I'm thirsty....penis." He also made up a new word. Zack now says the word "pena" when he really wants to say penis, but knows he shouldn't say that word. So when you hear him screaming, "PENA, PENA, PENA...." you'll know what he's thinking.
So now I've just decided to go with the flow. I don't encourage it, and when he brings it up I either ignore him or I ask him if he has a penis (which he responds "yes, Mom! And so does Brody!). Today after I asked him that he told me I needed to go buy one since I don't have one. Not gonna lie, I laughed pretty hard at that which probably didn't do anything to discourage him from talking about it. I'm thinking if I give him permission to talk about his special area, it might lose some of the magic and he'll stop thinking about it so much. Here's to hoping!
Here are some pictures of my potty-mouth child. If you don't want any play-dates for awhile, I completely understand. :)

