Google Dorks are search terms that can find vulnerable services, open directories, that kind of stuff. Stuff you shouldn't put publically on a web server that a search engine manages to find.
It'll find publicly accessible phpMyAdmin backups, so don't click any of the results if you want to stay in the legal side of things.
Googling "Google dork" or "Google hacking" should provide you with more examples. If you try modifying the query a few times, Google will make you fill out a captcha.
This is an example:
>intext:phpMyAdmin SQL Dump filetype:sql intext:INSERT INTO `admin` (`id`, `user`, `password`) VALUES
It'll find publicly accessible phpMyAdmin backups, so don't click any of the results if you want to stay in the legal side of things.
Googling "Google dork" or "Google hacking" should provide you with more examples. If you try modifying the query a few times, Google will make you fill out a captcha.