The ethics of metaculture are those that hold true regardless of which race, country, gender, religion, or nationality (culture) you happen to be in.
While Moral Relativism and Cultural Relativism can impact situational ethics, the general principles at work are those due to evolutionary psychology. The reward system that is built into our brains is designed to respond to primal things like love, sex, pain and food. These are experiences that are common to all people everywhere. How they manifest in day to day life depends heavily on the context of our cultural background, but the general principles at work are common to all.
The application of these ethics can be found in Evidence-Based Best Practices.