What about other one-word def.'s for various cultures?

"Green".

http://www.greenearth.org.gh/greenculture.htm

"hip-hop".

http://dir.yahoo.com/Society_and_Culture/Cultures_and_Groups/Hip_Hop/

"Graffito".

http://www.ethnicarts.org/undergroundart/
which includes this review of "Subway Art":

Subway art: - visually impressive, a graf "bible"!
Although a bit superficial textually 'Subway Art' could be considered a good introduction into graffiti culture.

Or, is "graffito" counter-culture?

I guess it depends on whether you are making an investment or a statement.

Of course, "graffito" doesn't have to appear on someone else's property to make a statement.

It can make a statement in the toniest of lofts.