1. A fake Santa Claus who slips through your water pipes, then steals your tree and replaces it with a computer depicting homosexual pornography he downloaded off a torrent.
2. Dignified term for someone who can actually detect humor and sarcasm delivered over chat rooms and forums.
"I am already dead"
Deriving from Omae wa mou shindeiru, it is usually used unironically among friends. It is also a cry for help that will be laughed at as you circle into the depths of despair, leaving behind any sanity you possess.
Joseph: Are you ready for the two hour school assembly?