In The Words of The Song, “Copy” is a Euphemism.
Your parents aren’t quite ready to explain some of the things you see on television when you’re young children, and the same is true for you. A situation like this is something that most parents will try to gloss over with vague, half-true explanations. However, this frequently results in the child engaging in more experimentation and re-enactment.
The discovery made by this mother is an excellent illustration of this. I am not sure what would have been the expressions of the mother who came across such a situation first you would have been really stunt by this but later on she would have burst of random laughter remembering this situation every now and then