Pro se is a way of describing people who file lawsuits without attorneys. It is Latin, say the lawyers, for "for self."
Either that, I suspect as someone who used to cover the federal courts, or for "Get out the decoder ring."
Mike Nichols of the Milwaukee Journal Sentinel writes about the tin-foil-hat crowd that exists at almost every courthouse, including Bart Ross, the man who committed suicide after killing the husband and mother of federal Judge Joan Lefkow. Details are here.