I don't believe the word "choker". If Romo was a choker he wouldn't have even put us in position to make this a "big game." If losing a big game means you are being a choker, then 50% of all QB's in the big games must be chokers!
Obviously some good or even great QB's will never win a ring. Does that mean they are all chokers? Or does that just mean that maybe there were better teams? Because that is what football is - a team sport where you win as a team and you lose as a team!