I'm glad this was posted. There has been discussion on this scene before about the line "...do you think I need to lose some weight..." I think the consensus by this board was that it was referring to "pool weight" or "speed", in other words pool ability.
I have always disagreed with that assessment, and believe it is referring to Forrest being heavy set. He has Newman so angry, that he is trying to push his buttons even more. Forrest might be thinking that Newman is calling him a fat slob or similar in Newman's head. So that is why he asks Newman that question, to get him even more fired up.
Its like when you beat a guy and then have your buddy, who obviously watched the match, go up to your opponent and ask him who won. It just fires the loser up.
