A system of backroads and throughstreets that lead you to where you started. Used by stoners with nowhere to smoke weed in a congested city. They drive these routes while smoking weed, because they are convinced that no police ever go through the systems of roads they used.
Joe: 'Hey fucknugget, don't spark that, cops come through here."
Chris: "Aight, Joe, lets go on a smoke route, hop in my car"