Meower

From meower (“one who meows”). The original Meowers, denizens of the alt.tv.beavis-n-butthead newsgroup, rendering the alt.fan.karl-malden.nose newsgroup unusable, began including the word "meow" in their posts in reference to a user of the latter newsgroup with the initials CAT; the "meow" itself was a reference to Henrietta Pussycat, a character from Mister Rogers’ Neighborhood.

来源：wiktionary