When the original poster of a forum thread is ridiculed, harassed, taunted, and humiliated due to the nature of the topic itself within the thread.
Basically, it's reverse trolling. The original poster starts a topic hoping to get shared interests, and instead the responses unanimously disagree with the OP (most likely due to the OP's newb status) regardless of their actual thoughts regarding the topic at hand. The OP then returns to defend his or her position until they are blue in the face and eventually meltdown in pure frustration and go absolutely bat shit bonkers.
OP meltdowns are hilarious.
Did you see that newb post that topic in OT yesterday? The OP meltdown was so intense that the poster actually killed his entire family.