1. nulled -
http://www.urbandictionary.com/define.php?term=nulled
when a company releases a script/program they have code in the scripts that call back home after u have installed it!
therefore the company can see who u are and whether u bought the script or not etc.
to null a script is to take away the "call back" so that u dont get in dog shit for installing a script that u didnt buy! hope this helped???