naggigator
A naggigator is the backseat passenger who yells orders at the driver but doesn't know where they're going. They’re like a broken GPS that also cusses you out.
'Turn left! No, turn right! Why are we still going straight? I'm gonna pee on your seat!'
'You missed the exit! I saw it! I saw it! I saw it!'
'I told you to take the highway! Now we're stuck in traffic! I'm gonna die in this car!'