I used to "invent" my own expressions and insults so I woudn't get in trouble for swearing. I once called a kid at school a 'Wild Shamrock' and I would say "What the peas?" to express confusion or "Oh, Tetris!" to express frustration or disgust.
A childhood belief about swearing

others believed things like this
- There was a Chinese takeaway near us called the Orient Express. I thought it was Onion Press. Yeah.— Spook
- When I was in preschool, the class bully told me that peas were actully cow boogers. Still won't eat peas.— Ren
- I thought that when I got older "they" would invent a cure for death and I could live forever.— wishful thinking
- I used to believe that swearing was just saying, “I swear!”Anon
- When I was a kid, I believed that bible school was "beauty school", and called it that all the time.— Dana
- I used to believe there was a legal age limit to swearing.— sarah