名草有主名花有主
[míng căo yŏu zhŭ míng huā yŏu zhŭ]
Meaning 'grass and flowers (metaphors for people) are already claimed', indicating the user is unavailable or off limits in terms of relationships. Similar conceptually to being 'taken'. It conveys the notion of respect for existing connections, often used when referring romantically linked individuals or items owned by others.