He's a-livin' in his butt

The story:

I knew The Who had a song titled "Eminence Front", but thought I had never heard it. I knew this tune was a Who song, but didn't know the title. I also knew they weren't singing "He's a-livin' in his butt", but sang it anyhow because it was funny. Riding in my car one day, a friend told me the title of the song, I told him my funny lyric, we both got a good laugh.