When I was going to UCLA  in Los Angeles for English classes I would always passes an elderly janitor that would say "What’s up". At that time I didn’t know what that meant. I would look up at the sky and say to him "Nothing" , because I could see nothing in the sky. Finally one day, he gripped my arm and said ," Listen boy! When I say what’s up, I ‘m just asking you how things are going !!.