In short, hotboxing is the act of smoking weed in an enclosed space. The purpose is to maximize the amount of smoke that's inhaled and to get as high as possible. Hotboxing can be done with a car, room or even a small closet.
The key to hotboxing is to seal off any openings so that the smoke doesn't escape. This can be done by hanging towels over doorways or windows, or by taping up cracks. Once the space is sealed, people will light up their weed and begin smoking.
Since there's nowhere for the smoke to go, it quickly fills up the space and becomes concentrated. This leads to a much more intense high than if you were smoking outside or in a well-ventilated area.
Hotboxing is often used as a way to get extremely stoned before going out partying or clubbing. That way, you're already at peak levels of intoxication when you walk through the door. It's also popular among people who want to save money on weed since you don't need nearly as much to get super duper high.
So there you have it! That's hotboxing in a nutshell. If you've never tried it before, we recommend finding some friends, sealing off a small space and giving it a go!