Until I was about 8 or 9 I believed that most people understood what was meant by the term "going grunties".
My mum says it originated from when I was tiny and used to make huge, exaggerated grunting sounds whilst trying to dislodge a number 2, but I had completely forgotten about that and thought it was an accepted term for a terd!
Imagine my embaressment when I was laughing at someone else for committing the cardinal sin of pooing in the school toilets and came out with "you can't go grunties at school!" only for the entire pack to turn on me instead! Serves me right for being a meanie in the first place, though.
A childhood belief about weeing and pooing

others believed things like this
- I used to believe that the term "being mugged" meant someone beat someone else with a coffee mug.— Matt Thiel
- When I was in elementary school nuns cam to our school. I thought that 'nun' meant they had no religion.Anon
- I thought the term maiden name actually applied to women who were maidens.— Natasha
- i used to think that the term 'necking' referred to boyfriends and girlfriends who rubbed their necks togetherAnon
- When I was a kid, I believed that bible school was "beauty school", and called it that all the time.— Dana
- Right when I started school, I believed that you could get kicked out of school for chewing gum. — Rheeb