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2.
When something that used to be underground and/or 1337 goes mainstream.

Only the real origional fans feel that the band (or whatever) has been de1337ed. Everyone else pretends that they were the origional fans and that the band (or whatever) is still underground and that they are so badass for knowing about it.
Avril de1337ed my tie.
by wysiwyg August 12, 2004
 
1.
When a 1337 member is downgraded.

The uber h4x0r got de1337ed by the police.

The Ubisoft president lost his job, the company decided to de1337 him.
by jesper.kyd January 03, 2009