autotroll 

When someone starts arguing about something that everyone else knows was clearly meant as a joke and not serious OR a troll (disguised as serious to incite a reaction), effectively trolling themselves by being stupid and overly literal.

Frick: Sarah Palin? Wasn't she one of the Monty Python cast? (heh heh)
Frack: No, you idiot! She used to be governor of Alaska. You're thinking of Michael Palin. Wow, you're dumb.
Frick: Yeah thanks, I was joking, you dipshit. Nice autotroll.

autotroll by Ed Bodine September 12, 2011

autotroll 

1. Someone who makes deliberately inflammatory or outrageous statements on his own website or other forum in order to attract attention and/or traffic.

2. The act of making such a statement.

Johnathan Alter autotrollis by attacking bloggers in "All Umbrage All the Time" just to get bloggers to talk about his article and link to it.

autotroll by D.B. Echo August 17, 2008