I heard the phrase "sitting on your laurels" - I thought laurels was a polite term for buttocks.
A childhood belief about speaking

others believed things like this
- Since my father had a deep cleft in his chin, I thought he was growing a tiny buttocks out of his face.— Rick
- I used to think that poop was stored in your buttocks and that's why they're squishy.Anon
- i used to believe that people's buttocks were plump because of the poo filled in it— Diesa
- i thought that the phrase "jet lag" was actually "jet leg" until i was 17...— truffles
- I thought the term maiden name actually applied to women who were maidens.— Natasha
- I thought the phrase "At one's disposal" meant you should dispose of the person or thing.— Geirskogul