what is dorking ?

Dorks are essentially search operators or keyword strings that are used in search engines such as Google to narrow down search results to find specific types of information, such as usernames, passwords, database entries or vulnerable websites
 
mm in short refers to Google dorks or Google hacking, it is used to search for specific and potentially vulnerable information on the Internet. In itself is to use operators and advanced search parameters in search engines such as Google, Bing or Yahoo to find sensitive information or identify potential vulnerabilities in websites or applications. You can find hidden pages, sensitive files or misconfigured web servers that may be exploitable, etc.

For example ...
1. filetype: to search for specific file types (e.g. PDF, DOC, XLS)
2. inurl: to search for specific URL patterns
3. intitle: to search for specific page titles
4. intext: to search for specific text within a page
5. site: to search within a specific web site

Using these operators in combination improves and makes the search more accurate.
I hope it helps you
 
for me its a tricks to get more accurate results on google search, you put some extra code in your keyword.