1. An unintentional lengthening of one's car ride by taking wrong turns; Primarily due to the driver being high on weed.
2. An intentional lengthening of one's car ride so that the driver and/or passengers may smoke weed. See bake route.
Susan: "John why are you so late?! Transformers 2 started ten minutes ago!"
John: "Sorry, we took a green detour so that we might actually enjoy this movie."