Rolling builds

I keep seeing people talking about rolling a build. What are they talking about? I know what it means in most rpgs but I haven't seen anything in Guild Wars to resembles rolling a build.

"Rolling a build" is essentially just making and running one. If someone asks you to "roll a tiger sin," you'd make an assassin (or your assassin) set up as that particular build.

To make, basically. If someone says they're rolling shock war, they're gonna be playing that bar. Same thing with re-rolling, means they're redoing either their char or build (often both).

Not to be confused with getting rolled. If someone says you got rolled, it means you were owned (hard).

Thanks y'all. Just wondered if I was missing something that should be obvious.