It means you should have a mechanic check it out soon. That could put you and others in a dangerous situation.
the ignition switch could be bad
Multi-tasking while driving means:
time for a major tune up
Either its dead or line is busy
Not much info to go on but, if it is a GM product I would suspect a fuel delivery problem, either a fuel pump going bad or a plugged up fuel filter.
it can mean masterbating with lotion while driving
If you mean Book... Then it is inadvisable to read while driving, under any circumstances.
driving while intoxicated.
DWT means driving while texting.
Smelling gas while driving could mean that your gas tank is leaking. You should definitely get it checked out.
I think you mean, "Why do my headlights turn of while I'm driving" There might be an issue with your fuses or eletrical system.