To be in a [hotbox]
or
To be in the act of [hotboxing]
> ---
> If I were in an air-tight room or vehicle burning incense or smoking marijuana, then I would be hotboxing it.
> Friend 1: Hey dude, let's hotbox it
> Friend 2: Alright *shuts all doors, windows, and vents*
> *Friend 1 and Friend 2 light their joints and/or incense*
> ---