'Come On Eileen songs' is the term used to group together songs, that, like "Come On Eileen", everybody knows, but nobody knows the words to. The real words apparently exist, but to most people, they are:

Poor Old Johnny Ray

Popular songs that are 'Come On Eileen songs' include:

To quote Weird Al Yankovic - "It's hard to bargle nawdle zouss with all these marbles in my mouth."