If you really want to exclude your website or part of your website from google search engine you can use the Robot Exclusion Standard technology.
By creating a specific robots.txt file you will be able to tell GoogleBot not to visit, crawl, index your website.
There is different methods to remove documents and not only websites from google search engine index.
You will find here a lot of useful informations on how to remove your listing from google search engine using a robots.txt file.
How to remove all my website from Google Index?
To remove your site from search engines (Not Only Google) and prevent all robots from crawling it in the future, you must create the following robots.txt file:
To remove your site from Google Search Engine use the following robots.txt file:
I have to remove my website from google fast!
If this is very urgent and you really have to remove your website from google, go on this page: Google Url Removal System.
Doing this and submitting with the help of Google URL removal system will cause a temporary, 180 day removal of your site from the Google index.
Are you sure you want to do this?
You will find many useful information about how to remove your URL from google database at Google Information for Webmasters.
This Site explains how to request removal from the Google web search engine. It also has good information for removal from other sites as well. Though be warned though, with the sheer number of search engines and the way many cache web-pages from “history” You have a lot of work ahead of you, and will most likely have to accept that there will always be some trace of the old site, somewhere. Just check out this site the internet is truly the worlds recording machine”