Sometimes I think Wikipedia bullsh'its

http://en.wikipedia.org/wiki/Meme

A meme (pronounced /ˈmiːm/, rhyming with "cream"[1]) is a unit of cultural ideas, symbols or practices, which can be transmitted from one mind to another through writing, speech, gestures, rituals or other imitable phenomena. (The etymology of the term relates to the Greek word μιμητισμός ([mɪmetɪsmos]) for "something imitated".)[2] Supporters of the concept regard memes as cultural analogues to genes, in that they self-replicate and respond to selective pressures.[3]

(The etymology of the term relates to the Greek word μιμητισμός ([mɪmetɪsmos]) for "something imitated".)