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