Google Hacks is a compilation of carefully crafted Google searches that expose novel functionality from Google's search and map services. For example, you can use it to view a timeline of your search results, view a map, search for music, search for books, and perform many other specific kinds of searches. You can also use this program to use google as a proxy. The name should not imply the way it should be used.
Hacks is meant as this definition. "A Hack is a modification of a program or device to give the user access to features otherwise were unavailable to them. " Taken from