Worthless assholes who are brainwashed by the media and are think that they have great fullfilling lives that everyone dreams of even though they dont, even themselves. People who day dream all day about what they should have done and what they could have in another life. They tend to try to get away from the dull roar of suburban life with things such as vacations, theme parks, etc. with their whiny ass annoying kids. They have sucky lives. Word comes from the latin roots "sub" meaning below and "urbanite" meaning people who live in the city and have interesting lives ( "inferior to urbanites")
Look at those suburbanites, with their green lawns and ugly houses...what a boring life.