When I was about 5 I was talking on the phone with my father - he to this day has somewhat of a dirty mouth - and apparently he used the word "f*ck" in a sentence and I'm not quite sure why but until I was about 10 or 11 I would SWEAR to you that it meant one of those red tin wagons. I think I even put it on my Christmas list one year to my mother's utter horror.
A childhood belief about swearing

others believed things like this
- I used to believe that having "oral sex" was talking dirty to your partner on the phone. Boy was I mistaken.— East End Kid
- up until i was like 13 i thought that oral sex was phone sex and dirty talk.— RoNiBoB311
- i used to think the word "suck" was a swear wordAnon
- I used to believe that bizarre was a swear word.Anon
- I used to believe that “shut up” was a swear word.Anon
- I used to believe that oral sex was getting naked and talking dirty/about sex under the covers— Bella