Does threadkiller refer more to the reply itself, the poster or more of both?
Is it any more than the last post to a thread prior to its drop off the front pages?
Is it independent of the posters intent?
Does it tend to have a negative connotation?
Has there ever a reply that was so great that everyone who read it was left speechless and thoughtless and no one could ever reply to that reply? Would that be a threadkiller?
(crawls back under his rock)