You can do it as mentioned below ... But by doing this all search engines will stop indexing your site.
Add the code below to your headinclude or headinclude_bottom template.
HTML Code:
<meta name="robots" content="noindex" />
--------------- Added [DATE]1400094366[/DATE] at [TIME]1400094366[/TIME] ---------------
You may add this to robots.txt file
Code:
User-Agent: bingbot
Disallow: /