(1) A mortgage loan used to purchase real estate. It may be seller-financing, institutional lender financing, or any other type,as long as the loan proceeds were used to purchase the property. Some states prohibit lenders from suing borrowers on purchase money mortgages if a foreclosure sale does not result in enough money to pay the debt in full. (2) Sometimes used to refer to a purchase money security interest in personal property.Personal property security interests are sometimes called chattel mortgages, hence the expression purchase money mortgage. (3) In bankruptcy, the debtor may not keep normally exempt assets without paying the creditor if the creditor has a purchase money security interest.