Naive

Ten years ago, oh okey...more than ten years ago...I was taking introduction to calculus and the professor made his introduction by writing something on the blackboard...yes, back then we use backboard! Anyway, everyone was laughing except me...then, I asked the guy sitting next to me what it means. He gave me a smile and whispered to me how he reads the one that was written on the black board...

So did you get it?