What is the meaning of some Olympic athletes putting their index finger to their lips as if saying ssshhh?

Question

What is the meaning of some Olympic athletes putting their index finger to their lips as if saying ssshhh?

Answer 1

We should take names and not applaud or celebrate them next time -  and just ignore them..

That'll teach em.

Answer 2

It was just Kobe's cute little way of silencing the Spaniards in the crowd. He felt that his 3 pointer and subsequent foul shot spelled the end for the Spanish team.  

Answer 3

I think I saw the archangel Gabriel (Cristopher Walken) do that same move when wreaking havoc in some of those blaspemous "Prophecy" movies.

Maybe all the U.S. atheletes are satanists?   Hmmmmmmm.