The act of rolling up one's right pant leg. This is usually done by people on bikes to avoid getting their pants caught in their gears. This is fashionable to some hipsters, whether they're near a bike or not.
Guy: "Man my pants keep brushing against this cut I have on my leg"
Friend: "Just hipster roll it for now, no one will care."
Guy: "Did you see that guy? He had a hipster roll and he was walking!"