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The concept of ""viral meme"" is not a mainstream academic concept, and only merits the briefest mention in an encyclopedia.  ""Meme"" is already treading on thin ground, but is at least well known enough to be semi-respectable.  ""Let's roll"" isn't a concept at allit's a phrase that has made the news recently, and it's the title of a song, both of which deserve to be covered.  ""Move zig"" is another phrase, probably meaning more or less the same thing, but it isn't worthy of inclusion here.  It isn't even a common enough idiom to be found in a dictionaryyou certainly wouldn't find it, say, in a New York Times used without reference to its source.  LDC
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