Love the name but everyone I know that has had superbowl related domains have gotten C&D letters.
This is purely generic and non dated which makes it especially appealing but I would be concerned with TM issues, especially now since the NFL has their own network.
And yes, they do own the TM on SuperBowl and there are no other definitions other than "the annual championship football game between the best team of the National Football Conference and that of the American Football Conference" or similar wording.