bench (verb)
In modern graffiti terminology, to bench is to sit on one's rear, preferably in a spot with a lot of rail traffic, and wait for trains to go by. When they do arrive, the bencher whips out his/her camera and shoots flicks like a crazed person.
Benching is a time-honored method of obtaining graffiti pictures, and dates back to the early 1970's in NYC. The bencher will become extremely familiar with train routes and schedules, and may occasionally run into hoboes, trainspotters, and other wacky types.