I have been making mistakes. My Chinese co-workers make some mistakes, too.

By thinking about other people's mistakes, however, I have learnt a lot. One day, one of my colleagues trashed her bananas, saying "it's too ripe." Obviously, what she said is Chinglish. We Chinese guys can understand it but people from other countries may get confused. I mused about this matter for some time. I thought it is fine to say that these bananas are rotten and I don't wanna eat them. Recently, I thought of this matter again and get my guess work confirmed from my 8-year-old.

Yes, if the banana has ripened to the extent that you don't want to eat them any more, they are rotten.

Let's try to express ourselves correctly.