Script-kiddie
Alternatively referred to as an ankle biter, a script-kiddie is an individual who utilizes information, scripts, or other software utilities to help exploit or break into a computer or computer program without having a full understanding of how the exploit works or how it was made.
What makes a script-kiddie different from a hacker or an advanced user is that a hacker or advanced user commonly has a vast understanding of what he or she is doing, explores and locates the security vulnerabilities, or creates the programs or scripts that others may use.
Also see: Hacker, Leetspeak, Scriptz, Underground