A group of people going to smoke their favorite herb. Often times will manifest as a line, resembling a train of sorts where people are the railcars. In addition, as the train travels to its final destination it will "pick up" more, eager to bake, friends along the way--like an actual train!
1) (in response to questioning) Riding the bake train, dude!
2) The Bake Train is leaving the station, all aboard! (at 420!)
3) (when observing a group, clearly intent on smoking) Check out the bake train! Wonder where its headed...
4) (to potential passengers) Hop on the bake train, man!