A Tattoo that has digital content, usually only visible through some kind of tech spec, like google goggles. Techniques include simple chip implants that are radio readable (like today's dog embedded dog ID) to digital ink that has embedded code which responds with link and graphic information instantly renderable upon viewing the "datt" or "digitatt"
My brother got a dattoo of his mustang last week. When you look through rendering specs it smokes the tires on his arm!
I google goggled that dattoed honey, and my specs made that taj-mahal on her back go 3 double D :).