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2.
The method of artificially enhancing one's tan in pictures after them being taken using some photo editing software. The most common way of doing this is increasing the saturation of the photo, then uploading to social networking sites.

Derived from Auto-tune, the software used to enhance vocals in many modern songs.
Nah she isn't, she just autotanned the photo, she's still pale really
by Scorpii September 13, 2010
 
1.
A person who always has a tan no matter what time of year it is.
Here comes Autotan. He is a Capital Ass.
by ugfest January 11, 2007