When one farts sufficiently in a confined space so that it becomes rather potent.

Derived from the hotbox, this is when u wait till your entire family is in the car and its raining outside. Once on the highway you fart you fucking brains out but cant open the windows due to the rain outside. All in the car die from odor as you laugh like satan spawn

The rectum, anal entrance.

a woman's anus used in sexual relations

The oh so wonderful butthole.

The Human Exit Pipe

When a group of people get together in a car, close all the windows, turn on the heat, and then all release rotten foul farts. The first one to open up a door or puke loses. It also helps if you all go out and eat food that gets your bowels rumbling before you partake in fartboxing.