The first step to get cash fast is to figure out how much money you need. If you need only a small amount you can likely just pawn a few items at your local pawn shop. You will be required to pay the loan back or they will sale the items you pawned. If you do not want to risk any of your personal belongings you can try a pay day lender. They will lend you money until your net paycheck from work. You will need to show prof of income and identity to get a pay day loan.
A simple option is to have a garage sale and sell some old items you no longer need or want. A short afternoon can score some extra cash and get rid of clutter around the house. You can even list your sale for free in craigslist and in some newspapers. Do not be afraid to lower prices a little if someone wants an item. You can even price your items a little high just so you have negotiating room if someone would like to bargain.
If you need a larger loan you may just want to ask friends or family for a short term loan. Make sure to pay them back or you will damage your relationship. You can use all of these ideas together until you raise the needed funds for your situation. Just make sure you do the right thing and pay back all loans according to the requirements listed in your contract.