Lazy consensus is a mechanism for making quick decisions in a project.
An individual announces to the project community that they are using lazy consensus for a decision. At this point, participants will discussion the potential decision. Any participant may veto the decision at that time (-1). If, after 72 hours, there are no active vetoes, the decision is accepted and the community is viewed as being in consensus on this decision.
The choice of 72 hours is to allow people across time-zones and with non-prpl responsibilities enough time to participate.
Lazy consensus can be used as part of the review-then-merge process for handling pull requests.