“Fusker” can be a verb, a noun that describes a technology for the web, or a noun that describes the output web page of that technology. As a verb, “to fusker” is to identify a range of images to a fusker script that returns a web page that displays all of the images within the range.
For example, if you go to a fusker web page’s form and enter the text http://www.example.com/images/pic[1-16].jpg, the fusker technology would produce a page that displays all sixteen images in that range, from http://www.example.com/images/pic1.jpg through http://www.example.com/images/pic16.jpg.
It is also possible to use lists of words by writing http://www.example.com/images/{small,medium,big}.jpg which will produce three urls, each with one word from the bracketed list. The web page is then presented to the person who did the fusker, and can also be saved on the fusker web server so that other people may view it.
Sources : http://en.wikipedia.org/wiki/Fusker