To smoke a cigarette or drug within a sealed tent in order to heat it up, or in the case of drugs, keep the fumes in. e.g: Jane hotboxed the tent earlier
To smoke marijuana in a small confined area, such as the inside of a car, until it is full of smoke, thereby purportedly intensifying the drug's effects
The act of smoking marijuana in a small confined area until it is full of smoke, typically a motor vehicle. The purpose is for the user to get "higher" by not letting any smoke out. Also known as clam baking, box out"