Two Incomes No Kids - A married couple who is more concerned about maintaining their current lifestyle rather than raising a child/children. Usually urban dwellers and the thought of a child is "icky" and inconvenient to their jet-setting ways.
Friend 1: "When are John and Jane going to have a kid, they've been married for five years and aren't getting any younger?"
Friend 2: "I think that they are pretty content to remain TINKs so they can continue their clubbing lifestyle."
Friend 1: "Probably a good thing as the kid would probably be neglected anyway."