Roughly speaking, a contrexing is a rebuke for attitude or bumptiousness or rudeness or severe lack of respect or being a troll.
ahhh, yes, Trolls get something they don't expect. They are begging for Flaming, and yet, POOF! they get a contrexing! what you do, is you make it bullet-proof. You take each point given by the poster and give a well-researched, immaculately drawn, bulletproof counterpoint. If you see any direct personal insults that seem out-of-context, then the contrexer is likely a trainee in the fine art of Contrexing. Although, the rules if Contrexing border the land of Flames, so one or two "yo mamas" might slip out even from the most season professional.
"overwhelmed by the dark side you must not be. Use insults in context and not as double-adjectives you must"
-The book of Contrex, "Fire Wrath Thee" 13-40