I used to think a "potty mouth" meant someone who ate doodoo.
A childhood belief about swearing

others believed things like this
- I used to think people had a "potty mouth" if they had been drinking out of the toilet.Anon
- My brother used to be scared to poop in the potty. He thought that he was pooping out his bones.— Lillyth
- I used to belive that if i put my foot in my mouth, I would get foot-and-mouth illness— Emily Sathrota
- that bathroom tap water was recycled "potty" water from the toliet. — livingdeadgirl
- i used to believe that sex meant love and that having sex meant the two people would live happily ever after.— amy
- i used to believe that if you farted out of your mouth, you'd die.— John Deere