Fuel/Oil spewing out of breather valve on valve cover.

WOW. I have never seen anything like this before. I put clamps on the fuel line last night and changed a tire out on the drivers side rear. I go to start the car up and it is giving me some trouble. I jump the battery and it starts. I had the air cleaner assembly off. I rev the engine and a mixture of fuel and oil comes spewing out of the breather valve hose. I immediately shut the car off. I could not beleive it at first so I started the car again and it did it again. I am disgusted and do not know if I even want to what could be wrong.