When a person, usually a passenger, in a vehicle is trying unsuccessfully to stay awake and is bobbing their head around as they drift in an out of consciousness.
John must've been wiped after that all-nighter in O-town, he was doing the dead disco the whole drive home.
A really amazingly, catchy song from the Indie/pop band Metric. (:
Dead rock and roll
Everything has been done
La la la la la la la la la la