1) the process of making a car sexy by adding performance parts or making it asthetically pleasing.
2) drooling over someone elses sex machine of a car
3)dreaming or thinking of what you want to do to your car to make it better/faster/ nicer.
1) Oh I saw a clean supra earlier, ever since then I have autoeroticizing about it.
2) Damn, I have been autoeroticizing about this slammed turbo GTI I saw last week with a fine girl in it.