This method is usually used for estimating quickly on a large chunk of user stories to get a feeling on the overall project effort or part of it. I know this estimation method has a name but I have forgotten it. Any clue?
The process in more detail: The whole team estimates, but only one single team member at a time. If a veto is given by a team member, the one who’s given the veto gives his estimate, allowing the rest of the team to veto again. This continues until no one vetos. In case of a circular vetoing the team members who are disagreeing discuss the task and finally come to an agreement. If no veto is given, the right to estimate is passed on to the next team member.