This post is for all the guys that tried and tried and tried and still did not find how to change the google site description.
I have changed my site from HTML to Joomla and then found out that Google changed all my site description from my site subject to "Joomla! - the dynamic portal engine and content management system." and the name of my site was the name of my Joomla template.
First the name of my site came from inside the HTML of my template in order to change it see extensions--> Template manager , Choose template and go in to edit HTML, Check that the H1 does not have an <alt> this was my first problem.
In the configuration file (mine is configuration.php) line :
/* Meta Settings */
var $MetaDesc = 'Joomla! - the dynamic portal engine and content management system';
var $MetaKeys = 'joomla, Joomla';
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