@Felthry it's slang for people who see you say something and then pester you with false politeness to try to silence you in the guise of debate
coined from this comic http://wondermark.com/1k62/
@Mycroft Oh, okay. I feel very out of the loop from never having used twitter!
@Felthry oh further context, on Twitter there's universal search, so trolls often search for key words and phrases to find their victims and start the sea lion process. My tip was that, unlike Twitter, that can't happen here, by design.