404xd 

boot someone off chat

you got 404xd, now get lost.

404xd by Otrakei April 11, 2009

404d 

When a web page is intentionally taken off-line, likely due to the documentation of illegal activities or contents.

That /s/ pre-teen page was 404d before I could dl them all!

404d by 4cheese April 18, 2010

404ed 

Whereby one person waits until 4:04 am/pm to hit somebody over the head with a keyboard.

*Smacks over the head with keyboard* 'You've been 404ed!'

404ed by ChristaM April 24, 2007