I tend to be pretty open about what I do if it fits the crowd - but there are times when I don't want to share or find it inappropriate. That's when I pull out the term "consultant" - which is technically true. For most inquiries it stops there. I don't think most people really care what you do, they are just trying to make conversation or find common ground. If someone persists beyond that I pull out the most boring thing I know - digital asset management. I have a friend that does this so I know enough of the buzzwords if needed - but really most people's eyes glaze over and we move on.