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.
6,654. Here is what is happening: They are giving you an option to make payments on the debt. They are protecting themselves against you not completing the payments with the confession of judgment. You sign and you have a judgment against you. They don't have to sue. They only have to file it. If you fail to complete the payment plan -- they will.