Fast cash is the process of getting a payday loan in a short period of time. Many payday loan companies advertise fast cash; however, with the majority of them you have to wait a day or two while they do a little background checking. Fast cash can be useful when if you need money immediately and don't have a payday for a few weeks. Fast cash is essentially buying the use of money. For example, a fast cash company may give you $100 to spend, but you have to pay back $115 within two weeks. In that case you would have bought the use of $100 for $15 from the fast cash company.
Fast cash companies are often accused of taking advantage of people in need as their interest rates are exorbitant and they often set up shops in impoverished and financially uneducated areas of town.