Well, this isn't really miheard, ju8st misunderstood i suppose. There is a piece of classical music on guitar called air on the G-string, meaning guitar, but i wasn't too clued up on instruments at the time, so i thought it was like describing a blow-job or something.
A childhood belief about songs

others believed things like this
- I used to think that air guitar was a style of guitar playing in rock music.Anon
- i used to think air guitar was the same as electric guitar, i just thought air guitar was ran by air.Anon
- I used to think that an air guitar was a real instrument. I though it was a guitar powered by air..— Amanda
- when i was little i used to think that air guitar was an actual type of guitar!lol!Anon
- i used to think the air guitar was a real instument— allen
- I used to believe that if you had an animal listen to classical music, it'd eventually learn how to talk.Anon