On the show "My Life as a Teenage Robot," there was a song called "The Miki Momo." I was so sure as a kid that it was a direct parody of another song, called "Michi Mombre." I had even heard it in my gym class:
"Mombre, muvva-nuvva, I'm gonna mamba, I'm gonna Michi-michi-michi-michi Mombre, muvva-nuvva...."
What I was ACTUALLY hearing was the song "One Way or Another" by Blondie. For years I thought the song was called "Michi-Mombre" and there was a dance that went along with it, obviously, called the "Michi Mombre Muvva-Nuvva."
A childhood belief about misheard lyrics

others believed things like this
- The song called heart of glass mixed me up as a kid. I heard "Heart and ass". — oops
- I use to think that Bruce Springsteen's song "growing up" was called "throwing up"— glowworm
- I used to think the song Bette Davis Eyes was called 'she's got better days besides'.— JJ Simpson
- When I first heard Bruce Springsteen's song, "Born in the USA," I thought that the song was "Porn in the USA"Anon
- I used to think the song "love the one you're with" was called "love the one, your win. — Glowworm
- The Kim Carnes song called 'Bette Davis Eyes' well my dad used to sing "She's got Dickie Davis Eyes" Anon