First, a man performs anal sex on his partner. After finishing, he must remain in his partner's anus until he is able to urinate. He then urinates into the anal cavity. He then pulls out while his partner clenches the anus, containing the "goodness". The man puts his face in front of his partners anus while his partner expels the contents inside of the anal cavity all over the face of the man.
Last night my girl gave me a New Jersey Volcano.