Meme

A meme is a thought that eats someone's head and, liking the taste, goes out to find more.

As defined by Richard Dawkins in The Selfish Gene (1976): "a unit of cultural transmission, or a unit of imitation." "Examples of memes are tunes, ideas, catch-phrases, clothes fashions, ways of making pots or of building arches. Just as genes propagate themselves in the gene pool by leaping from body to body via sperms or eggs, so memes propagate themselves in the meme pool by leaping from brain to brain via a process which, in the broad sense, can be called imitation." But your definition was so much cooler. -FrozenHermit