A word used to describe a person’s attitude, or lack thereof, after hearing or seeing something they feel totally in-different about; tuning-out. It comes from the generation of mass mobile text users, and millions of IM (instant message) users; when someone appears to be offline, but in actually they're only invisible to people on their buddy list; and new form of giving the cold shoulder, literally.
Tom: Jessica and I wanted to go watch a movie, and grab something to eat.
Jack: She told me that she was sick, and didn't feel so good.
Tom: Oh, Jack, don't go visi-mode on me.