The term "subprime borrower" refers to a person or entity with a poor credit history, who is considered by lenders as being at high risk for defaulting on loans. Subprime borrowers typically have low credit scores and may also have other financial challenges that make it difficult for them to obtain traditional financing from banks or other mainstream lenders. As a result, they often turn to alternative sources of credit such as payday loans, title loans, or subprime mortgages which come with higher interest rates due to the increased risk associated with these borrowers.