That is Ryan Vogelsong at the World Series Championship parade that was held on 10/31/12. He spoke those words as the last thing he said in his speech (as depicted by my sig). Apparently it was a rallying cry for the Giants that started in the first round versus CIN. It's in reference to a video that has gone massively viral on YouTube that you should probably watch if you haven't yet; the hotlink in the text underneath my Vogelsong sig sends you to a gif of the climax of said video. I just happened to have a friend show me that YouTube video just hours before I saw the Vogelsong video so it kind of blew my mind when I initially saw/heard what Vogey said. Super random and funny, especially coming from the very mild-mannered and serious Vogelsong.
http://www.youtube.com/watch?v=u0103uw6q0s