One who sits on the furthest row of seats in a vehicle like a bus, a van, or a car. The term implies (often ironically) that those who sit at the back are "cool" and/or "mischievous".
Those backseatbandits are causing mayhem again. What is about the back of a bus that gives kids such a powertrip?
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.