I would honestly love to know the answer to this question too. I have had very few dreams I can remember over the past year or so. But, about a week ago I had this very unusual dream which involved a two headed snake.

I was a lil child in a long white sari. I was playing hide and seek in the garden of a large stone temple...and I looked into this lil watery hole about a foot across and a foot deep. There, in the bottom of this hole, in some muddy water was a beautiful smiling snake...with two very stunningly beautiful heads. It was a warm brown color...its heads were elegant...very slim..but wide...with very large golden eyes. It looked up and saw me looking down. Then, it smiled very very happily and suddenly came out of the hole. I quickly backed up and set myself back against the wall of the stone temple. But the snake moved past me...and climbed the wall behind me...as it moved between me and the stone, up the wall...I could feel this amazing feeling, an intense rush, pressure climbing up the center of my back at my spine...and it came out the top of my head.

That was the dream.