How do you shut up an annoying girl?

A swift kick.

You stick an Apple in his mouth..... or you kiss him and walk away... that will get him to shut up

The best method that will not get you into trouble is to tell him that he is annoying to you.

Answer

Figure out what he is trying to get from talking. Then, don't give him what he is looking for--totally ignore him and go about your business. Walk away if you can.