"While it's important to respect your children's privacy, understanding what your teenager's online slang means and how to decipher it is important as you help guide their online experience," explains Microsoft in A parent's primer to computer slang.
The page explains how leet works and lists some common terms. Note:
Leet words possibly indicating illegal activity:
• "warez" or "w4r3z": Illegally copied software available for download.
• "h4x": Read as "hacks," or what a computer hacker does.
• "sploitz" (short for exploits): Vulnerabilities in computer software used by hackers.
• "pwn": A typo-deliberate version of own, a slang term that means to dominate. This could also be spelled "0\/\/n3d" or "pwn3d," among other variations. Online video game bullies or "griefers" often use this term.
Kewl!