The Order of the Mop is an award given to administrators (and bureaucrats) who do an exemplary job in making sure Wikipedians like you and me have an enjoyable time on Wikipedia, those who are made members of the order often work outside of their comfort zone without hassle and set a good example, while maintaining a good sense of humour 
members of the order are entitled bragging rights 
(joking! 
) unfortunately there is no title or post-nominal suffix that comes with this title.
Once made a member that administrator or bureaucrat will be inducted as a member for life, the privilege will not be revoked unless that member has had their tools revoked at the request of the Arbitration Committee or because of misconduct.