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In the context of this website, it's just a big argument between users, often spinning into multiple threads.
In the context of Maoist China, they were public shaming sessions of reactionaries (or at least people accused of being reactionary).
It's like an intervention, but instead of for drugs it's for bad ideas.
It's when Roxas and Vivi hit each other with foam bats and balls fly out and whoever collects the most balls wins