I had only heard the word "boobs" used to refer to boobs, never the anatomically correct term (breasts).
So one time at a swim lesson my teacher told me she wanted me to practice "big breaths." Well, I thought she said breasts! Not too familiar with that word, I thought it meant breaching--as in, a whale jumping out of the water!
A childhood belief about speaking

others believed things like this
- When I first started to develop my breasts I thought it meant I was producing milk— trisha
- In first grade, I thought that if I've never heard of a word before, then it wasn't a word.— Destiny
- For years I heard the word "pedophile" and thought it meant a pedicurist's tool.— Lauren
- When I was young, I heard the word 'minion' for the first time and thought it was a miniature onion.— Karin
- My friend told me you have to drink milk to get boobs LOOL— Roxanne
- WHEN I WAS LITTLE I USED TO THINK THAT GIRLS GET BOOBS BY ONE DAY GOING TO SLEEP AND IT JUST HAPPENS— J.C