aerosol art
n.— «Mr. Beer said his work is not gang related and he sees graffiti (or aerosol art as he calls it) as art, whereas the symbols and numbers done by gangs or bored teenagers is vandalism.» —“Pickering passes new graffiti bylaw” by Danielle Milley in Pickering Durham Region news (Ontario, Canada) Oct. 19, 2006. (source: Double-Tongued Dictionary)