While watching the Inspector Lindley series on PBS two sundays ago, the word 'mokita' was spray painted on a wall. It was the clue that broke the mystery.

I found the meaning for "mokita": something, especially a secret, that everyone knows but nobody talks about. But I have not been able to find where the word comes from.

In Spanish we have a term, 'mosquita muerta', which means, literally, a dead fly; one that gets swatted, is stunned and lays dormant, but then flies off. It describes a person that is seen but not heard and is always listening to what is being said; then goes off and gossips about what has been heard. I suppose the English translation would be a "fly on the wall." I thought the difference in spelling mokita/mosquita was not that important.

Can you tell me where this very interesting word comes from?