A 'tagger' is a member of our richly diverse culture that specializes in custom painting walls, concrete bridges and railroad boxcars.
Not long ago I was walking trough a part of Brookline,MA (proud home of Mike Dukakis...very liberal and very,*very* rich) with my sister and noticed some graffitti on the mailbox of a very expensive house.I commented to my sister that the homeowners of that area will be thrilled to see the arrival of that "richly diverse culture".