Metamodernism is variously called a cultural paradigm, a cultural philosophy, a structure of feeling, and a system of logic. All these phrases really mean is that, like its predecessors modernism and postmodernism, metamodernism is a particular lens for thinking about the self, language, culture, and meaning -- really, about everything.
While metamodernism is not a movement or a manifesto for living, it is nevertheless possible for individuals, groups, and even social and political structures to come to be informed by metamodern principles. Metamodernists believe that this increasingly happens whether we will it or not; such philosophers and theorists consider metamodernism to be the "dominant" paradigm in many places, which simply means that events and structures in those places naturally gravitate toward a metamodern state.