Kamapichachi is a miss-spelling of word Kamapicsachi that is a hindi word. Kama means sexual desire in general sense and pisachi means demon. Thus Kamapicsachi means a demon driven by lust and is used to for a person whose thoughts and actions are lecherous. There is a website too with the name that publishes the fake nude photos of Indian actresses. But the term kamapichachi has become famous that is incredible. Update : Now the word kamapichachi has come to denote the sexy actresses photos without clothes posing in a seductive way and hot scenes from movies like bathing scenes bedroom scenes, kissing scenes and more. One can visit the above kamapichachi blog for more hot photos. These wallpapers are still so popular that pictures from 2010, 2011 are searched even now. Moreover, there is an increased interest in latest 2012 images.
Update : Some new kamapisachi wallpapers have been updated on this blog.