Ask anybody in the Lowcountry why Mt. Pleasant is called Mt. Pleasant, and they’ll tell you they have no idea. 

Now, I could bore you with stories about how Mt. Pleasant was the name of plantation owned by Jacob Motte, and I could tell you that Motte built his house, what is now know as Hibben House, on his plantation in 1755. But I’m not going to do that. I’m just going to cut to the chase. Mt. Pleasant is a slang term that was commonly used in mid-1700s America, and, well, it’s a euphemism for “vagina.”

That’s right, ladies and gentlemen, our fair friends over the Cooper River live in a vagina. Ha.

For more sources, go here, here, here, and here