The human hotbox is a way to smoke weed outside with 3 to 5 people while enjoying the benefits of indoor/in car hotboxing. The smokers all stand in a tight circle and put their heads down to create an area where the smoke will be contained. They then smoke either a bong, joint, or pipe and get zooted.
P1: "Yo man, we're going out to north beach to smoke some bud. We're going to human hotbox. You in?"