Welcome to the most random blog entry to ever grace Covering the Spread:

Within imageboards such as 4chan, a special status has been afforded the character of Milhouse Van Houten from The Simpsons. Following an online campaign to gain Milhouse meme-status (an activity known as “forcing a meme”), it became a common occurrence for imageboard users to exclaim that Milhouse is “not a meme” whenever someone professed otherwise. This exclamation became so common that eventually the term “Milhouse is not a meme” itself became a meme. Users have jokingly telescoped this concept out further such that “Milhouse is not a meme is a meme” has also arguably become a meme. The process could potentially be extended ad infinitum, however to date “Milhouse is not a meme is a meme is also a meme” is not a meme.

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