meower
From the ancient history of the internets, and usenet in particular, a meower was an early sort of organized troll. Basically, meowers were a group of usenet trolls who congregated in the newsfroup alt.fan.karl-malden.nose. There, they would organize raids on other, unsuspecting newsgroups, descending upon them in droves, and flooding the group with 'meow' messages or cascades, thus rapidly rendering their target completely unusable.
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