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1.
On a message board, posting something irrelevent on a really old topic to bring it to the top of the list topics. name comes from the fact that you are bringing it back from the dead, thus Necro. a practice common among n00blars.
n00b: I think necroposting is funny.
me: ::bitchslaps::
by Bob Dole January 17, 2004
 
2.
The act of posting in a forum thread that is too old to matter any more, or has served it's purpose.
Usually by new, inexperienced members of the board.

A common trait of someone necroposting is not to only bring one old thread back from the last page before deletion, but to fill up the entire first page with threads that only they seem to think have relevance to anything.
Date: 15th June 07
Comment: blah blah blah

Date: 2nd November 07
Comment: I totally agree!

Date: 2nd November 07
Comment: Quit necroposting.
by Fyrburn May 20, 2007