This is the share price of the company divided by the free cash flow. Free cashflow is the operating cashflow minus capital expenditures. A more detailed definition would be (Earnings before interest and taxes * (1-Tax Rate) + Depreciation & Amortization - Change in Net Working Capital - Capital Expenditure)
Free Cashflow is the amount left over a company can use to pay down debt, distribute as dividends, or reinvest to grow the business.
This ratio is similar to Price to Earnings, but omitting purely "paper only" expenses. Some companies report high profits, but they can't turn those profits into cash! A company can't survive without cash, and if it can't generate it internally it will have to go to outside investors to support it, resulting in either share dilution or increased borrowing.