1. Someone who makes the last post in a forum thread
2. A mod
who is known for killing threads when they get off topic.
3. A person in a forum that is notorious for getting threads locked by the mods.
1. Nobody knows how to respond to bashturn's brilliant stupidity, so he is often a thread killer.
2. JPKeates usually explains why a thread must end with a great last post. He is a very accomplished thread killer.
3. CJ and Dug are thread killers, six threads got locked
today because of their off topic ramblings.