its a way of saying hi to the umpire if they know them and they havent seen them in a while. i was at the cubs-cardinals game a few weeks ago(actually a long time ago), pujols and sosa both did it. you just dont "see" the umpire aknowledge it.
at least thats what i have been told, makes sense to me. just a little meet and greet thing, since he cant chat with them and hold up the game. its like saying "whats up"
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