One use of this word refers to the urban sport of spray-painting things. Your typical tagger will be a guy dressed in threadbare clothes with a little brown glove and a can of spray-paint or a Magnum paint marker. Taggers sometimes belong to gangs of taggers who all add their little symbol to their graffiti. They comprise a subculture with its own set of rules and requirements. Graffiti art might be hard to read, or look a little schizo, but a little bit of practice and you will be able to recognize and read it.