We sang it in music assembly in infant school so would have been mid 80s.
You pointed to parts of your body but instead of the correct word it was funny versions - I can’t remember exactly but I think mouth was cake-eater and eyes were ‘something’-blinkers.
You started with the head then the next verse was eyes and the chorus was pointing at the body parts in reverse order then saying something like ‘nick nock woo, that’s what they say at school’
It’s driving me mad trying to remember it.
My sisters (a year either side of me) don’t remember and say I’m making it up but I know I’m not!