If I was going to be rude, I'd say it was a rationalist who'd been hit in the head with a post. But I'm not going to endorse that statement.
Note that some people who are called "post-rationalist" are highly respected by almost all members of the LessWrong community.
A long time ago, in the colder seasons, I asked for suggestions for a Shit Rationalists Say video. Due to other concerns it took me this long to put it together, and the meme has long since passed. However, here it is.
Shit Rationalists Say
It is my first time in front of a camera, so I'm shakey. But I learned, and there it is.