Kobe spelled backwards. Meaning, the opposite of Kobe. To be Kobe is to be sheer amazement. eboK is more along the lines of pathetic. When a shot is put up in a basketball game that is good and swishes perfectly, often people will say "Kobe" ...when a terrible shot is put up and has no chance of going in, you say "eboK"
Shot from 3-point range... hits very top of glass, or just hits hard off the iron... "eboK"