A massive series of banning or account deletions of unwanted trolls in a forum, image board, or social networking site.
Troll #1: Hey, /b/rother! You're back! What happened?

Troll #2: A trollocaust; I was one among many trolls on here that got axed.
by Zovos August 02, 2011
Any instance of massive trolling, whether it be on a message board, or a chat room, or what have you. The trollacaust can include one person, 10 people, or a million people.
We went on this chat room and totally disrupted it...it was an epic trollocaust.
by Chigglywiggly January 31, 2010

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