Here's how it's used in the book:
* "They were looking for a rumble, looking to roll the Greasers." This means the Socs wanted to fight the Greasers.
* "We were going to roll the Socs." This means the Greasers were preparing to fight the Socs.
So, when someone says "rolled" in The Outsiders, they mean they're about to have a fight.