Snakes represent difficulties and troubles. A snake bites its tongue, which means that someone is trying to stop you from telling the truth in something, which means that you are an insider. Dreams are predicted in advance, as long as they are handled well, there are no big obstacles.
Another explanation is that snakes are symbols of money. Being bitten by a snake means getting pocket money and having wealth. I hope it will come true here. Wish you all the best!