(verb) to comment on an internet thread long after the conversation has concluded, often using information
that did not exist at the time of the original thread.
user1, June 14, 2008: The Dark Knight is the best movie of all time.
user44, Sept 8, 2010: I disagree, Inception blows it away.
user1, Sept 8, 2010: Check the date before you necro threads, moron.
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.