A plea and pass is a legal term that is used to describe a certain kind of agreement. If a person chooses a plea and pass, they plead guilty but the court defers an immediate finding. The court will make the person agree to complete a program and if they are successful, the case will be dismissed.
By pleading "no contest" you are admitting that you believe the state has enough evidence to convict you but you will not force them to go through an entire court trial to prove it. It has the same effect as a guilty plea, but sounds "nicer."