What made you want to look up corpus uteri? Please tell us where you read or heard it (including the quote, if possible).
Confession of judgment is a legal term that refers to a type of contract (or a clause with such a provision) in which a party agrees to let the other party enter a judgment against him or her.
As a creditor, there is perhaps no greater tool than a valid confession of judgment clause within your written agreement with a customer. Imagine a customer fails to make payment on its commercial credit account. Now you must decide whether or not to hire an attorney and initiate a lawsuit.