I, too, sang "every time you go away, you take a piece of meat with you."
In "Got my Mind Set On You" by George Harrison, I used to sing it "Oh, God, my mom sat on you", and could never figure out why it was gonna take plenty of money to do it right.
My mom thought that "Never gonna Give You Up" by Rick Astley went "Man, I'm gonna give you up, Man I'm gonna let you down, Man I'm gonna run around and desert you." I was 15 when I finally figured out why she always wanted me to change that "hateful" song when it came on the radio.
A childhood belief about misheard lyrics

others believed things like this
- I was told that for every christmas carol i sang before christmas time santa would give me one less present!— K
- I thought Maria Carey's 1998 ballad was 'I'd give my arms' instead of 'I'd give my all'.— Briony Maggs
- I used to belive that if you went up to an ATM it would just give you money out that is not your own money.Anon
- I used to believe that a bank was a place where they give out money to peopleAnon
- When i was child i used to believe that when i lose one tooth, a little mouse will give me some money.— Daniele
- My brother was listening to The Corrs and instead "leave me breathless" he would sing "give me breakfast".Anon