I thought "f*** you" meant "thank you" in an ironic way, like if you messed your work up and someone is upset.
A childhood belief about swearing

others believed things like this
- I thought that every TV show was filed live, and I always wondered why they never messed up.— Steve
- I used to think if you messed with your belly button too much, It would pop out and you would spring a leak.— Jessica
- My uncle once said that elves were really badchildren made to work in santa's work shop— Some guy
- i used to believe that if i didn't work at school, i would have donkey ears, so now i work hard !!!— denis
- When the Queen Mother died when I was quite upset because I thought royalty did not die.— Carrie
- I thought that my parents chose my cousins, and was upset when my mother wouldn't let me add one.Anon