O.C.G.A. § 17-15A-2

As used in this chapter, the term “graffiti” means any inscriptions, words, figures, paintings, or other defacements that are written, marked, etched, scratched, sprayed, drawn, painted, or engraved on or otherwise affixed to any surface of real property or improvements thereon without prior authorization of the owner or occupant of the property by means of any aerosol paint container, broad-tipped marker, gum label, paint stick, graffiti stick, etching equipment, brush, or other device capable of scarring or leaving a visible mark on any surface.