This song actually does have a meaning that's kinda hard to understand, well I guess saying that "I am the Walrus" is kinda like saying that you are dead in some weird tribe language or something strange like that and they were pretending Paul was dead. On the cover of that album they showed the four of them walking down a street and Paul wasn't wearing shoes because they used to bury the dead with no shoes on. And, supposively, if you listen to the song backwards it says something like "paul is dead miss him miss him" but it's kind of mumbled and it's not the lyrics backwards that make that sound, it's the funny noise at 2: 00.