It means that any game after the regular season is now off limits to the program.
And when you consider that the Rose Bowl, or any other BCS Bowl, are the main post season games in which USC appears, with a 17 million dollar payout, it can be a substantial shot to the school's budget.
Additionally, if the PAC-10 expands to 16 teams with a conference championship game, that would likely be an additional double digit millions they would be forbidden to take part in, even if they had the best conference record.
So a "post season ban" could wind up costing USC between 17-35 million bucks and severely hamper their recruiting activities since high school kids like to envision themselves sitting on the bench in their freshman year of college mouthing the words "Hi Mom" on national TV.
Of course “post season” makes perfect sense now - lol - I was wondering if they got any TV sanctions?