American: It's like the climax of the whole (American) football season, where two strongest teams will compete against each other, it's much like Champion's League Finals to you guys.
ERRRRRRRRRRRRRAAAOOOWWWW! "Assume the position! You're under arrest for copyright infringement!"
"No, no, I meant "the Big Game! Please, I have a family!"
Dude2: Naw, I was too busy gettin' laid.
Should be considered a Nationwide holiday, but sadly isn't.
The whole reason for having a Superbowl party is to drink beer, yell loudly for no reason, fight with the neighbors over what team will win, ingest so much food that you will be full for 3 weeks, watch stupid commercials and laugh uncontrollably at how they make no sense, and to make ridiculous bets that will have your co-workers laughing at you for over 6 months.