Leet, the language of the Geeks and Hackers.
To speak leet, you more or less need to un-learn proper english. The history of leet goes back to the early days of online message boards, or forums, where users can post messages to carry on a threaded conversation. In an attempt to “Clean-Up” the language that users would sometimes post, admins added a filtering system to the message board which would replace restricted words with some type of alternative.