Until I was about ten I had always sang the song "Waterfalls" by TLC as, "Go go Jason Waterfalls..." I always wondered who he was.
I also believed for a long time that the lyrics in the song "Hot in Here" by Nelly, "Dancin' in front of the mirror while you're on the phone sayin', 'girl, I think my butt's gettin big!'" was "'Girl, I think my butt can bend!'"
I'll never live those down.
A childhood belief about misheard lyrics

others believed things like this
- That Madonna sang "I'm a cheerio girl" instead of material girl— HN
- I used to think my belly bottom was my "front butt" lol i know...stupid!— Megan
- i believed that michelle gayle's sweetness song contained the lyrics shade in sheep shit!— andrew
- Yep I thought the Zephyr song was fly away on my cell phone— Jenny
- for my little sis -
Paul McCarty song "Band on the Run" but when she sang it it was "Man has the Runs"Anon - I used to think that the actors on tv shows sang the show's theme song.Anon