Every time I have heard the term it refers to Debt To Income ratio. Lender use this to determine how much home you can afford. I believe different areas have different ratio thresholds. So check with a local lender to find out.
A debt-to-income ratio is one way lenders measure your ability to manage the payments you make every month to repay the money you have borrowed.
To calculate your debt-to-income ratio, you add up all your monthly debt payments and divide them by your gross monthly income. Your gross monthly income is generally the amount of money you have earned before your taxes and other deductions are taken out.