Getting into your buddies car with a bunch of other friends, smoking a "bowl" of marijuana and going for a long ride with no specific destination or specific route. Usually accompanied with loud Trance, Rap, or Classic Rock (such as Led Zeppelin or Pink Floyd) blasting through the speakers of the car.
Usually one will forget where they are, where they have been or how they got to their current location.
It is a good Idea to take a GPS to get home depending on how high you are.
Todd- Dude, wanna go on a bowl run
DJ- Sure man, but only if we take the GPS this time. I don't want to get lost on the back roads of the sticks again