2001 Pontiac Grand Prix Major Oil Leak

I was driving down the highway at about 80 when out of nowhere my car starts smoking. I pull over, pop the hood, oil everywhere. After making it back home on a good samaritins stock of oil, I was out of oil again. I put more oil in, car not running, no major leak. I start the car and it's spitting and spewing at a great rate out of what looks like some type of electrical plug almost dead center, towards the bottom, front, just under the valve cover. I have no idea what this is and I know it might be hard to picture it but any help would be awesome. Thanks.