"To see a snake or be bitten by one in your dream signifies hidden fears and worries that are threatening you. Your dream may be alerting you to something in your waking life that you are not aware of or that has not yet surfaced. Alternatively, the snake may be seen as phallic and thus symbolize temptation, dangerous and forbidden sexuality."

You can check out more at dreammoods.com I've found this site very helpful.