You mean 24/7 D/s relationship? It is relationship where the dominant submissive roles are 24/7. And not just in scenes. The submissive is always submissive and the dom has control over her all the time (unless said otherwise). Usually the dom has set certain rules for the sub in that case. Like she has to wait for him naked (when he comes from work) or do the chores and she can't curse or may speak only when spoken to.