I thought that "toony" was a slang term for a part of your body of which you had two, as in the song "Ballin' the Jack" (First you put your toonies close up tight). (OUCH!)
A childhood belief about misheard lyrics

others believed things like this
- "Chassis" is slang for a woman's body, especially her genitalia.
— Siddharth Mehrotra - When i was little i thought that the soul was a physical part of your body that looked like shell pastaAnon
- For whatever reason, I thought that grass was slang for tobacco rather than marijuana.Anon
- i used to believe that tha if I had any body part stisking out of the bed it would get me— strait sleeper
- I used to think Cockneys only ever talked in rhyming slang.Anon
- I thought Jack was a nickname for Jackery ( like Zack and Zachary).— Bootlebat