Someone who sits in the passenger seat and narrates your driving like they’re the instructor on a dodgy crash course. They dish out unwanted directions, commentary, and panic noises, even when you clearly know the route. Often said with affection, but it can also mean someone who meddles in anything they’re not actually doing. Proper wind-up merchant behaviour.
"Dave’s in the passenger seat going, indicate, slow down, mate, that’s not a gap. I’m driving fine. He can’t even parallel park outside Tesco without sweating."