When a troll continues arguing in a flame war thread that is long dead as both sides have made all of their points and have stopped caring.
Offenders are typically crying for attention, with have low self esteem and attention deficit problems.
Similar to the traditional "flogging a dead horse".
Pseudo-intellectual 1: Well I don't want to say too much on the topic, but: ... (5 paragraphs of opinionated rant).
Pseudo-intellectual 2: I support this, and would like to further add: ... (3 paragraphs of rhetorical questions and half-baked psycho-analysis).
<2 weeks later>
Ring-in: This isn't really my argument but in my opinion both sides are wrong. I don't want to say a lot but... (10 paragraphs of literary quotes, topical allusions and first year philosophy diploma name dropping).
Observer: Doesn't this ring-in know that he's blogging a dead horse?