How to get site unindexed

Hi

I have a problem - I had to update old site. I got 30% of pay before the work and the rest should have been after the work was done. I made a mistake, by uploading changes to site. After that, owner refused to pay, so I took the changes off, leaving the site as it was. Seems like he downloaded the new version before I could upload the old version.

I started to search for this man in Google and seems that he is actually srewed lot of people over the years (I mean not only with website, but profesionally doing what he does). Then I thought, maybe I can do something to get his site off the Google or make it untrusted. I still have the ftp access, but what would be the best way to get him back and free the internet from his website? :happysad:

Thanks in advance!

Blast it with gambling/porn/adult related links and cross your fingers.

Get thousandss of backlinks from spammy sites in a few hours and google will drop him.

to deindex a site>>>>>> google.com/webmasters/tools/removals

or

1. In your root file add robot.txt file and disallow all the unwanted pages which are indexed right now.
2. Delete all pages from cache results and remove that url which you want to de-index by remove url coloum from webmaster tool
3. Use 404 error
5. Put 301 redirect on 404 Error