The method of quoting someone's forum post piece by piece (often taking their words out of context) in order to disect, degrade and ridicule their argument.
This term originated on the Relic forums back in 1999-2000 when a user there named Omnislash regularly used this method to argue with other forum members.
"You're kidding me,"
I never kid!
"if that were the case.."
The case? A suitcase?!?!
"then why does it seem"
Seems madame? I know not seems..
"like you're not making sense?"
I use sense, but I don't claim to make anything!