"Don't lets your memes be dreams" - Ron Paul

A "meme" is a virally-transmitted cultural symbol or social idea. A meme (rhymes with "team") behaves like a flu or a cold virus, traveling from person to person quickly, but transmitting an idea instead of a lifeform. According to Cecil Adams of theStraightDope.com, the concept of memes "is either really deep, or really, really obvious".