The sexual act of one sitting on their partners face with the anus covering their mouth, and passing as much gas as inside your body. The victims nose should be squeezed shut so he/she has to breathe it all in through their mouth. Also, some variations include the excrement of faeces into their mouth.
Husband: Shut up woman, and make me a sandwich, otherwise I'll Gas Chamber you later tonight, capiche?
Farting while in an enclosed space, such as an elevator, where you victim(s) cannot escape in a hurry. This forces those that are trapped to breath in the odor until it is possible for them to leave.
Once at 2:00 in the morning at the airport I was stuck on an elevator with a young couple and their single, misbehaving crotchfruit who would not stop bumping into my broken arm. Being already pissed about having to travel internationally without much warning from my boss, I decided to get back at them by turning the elevator into a gas chamber just as I arrived at my floor. With the child's face being about ass-height, I felt quite satisfied after.