The act of farting while in the process of sitting. The result is finding your face in the exact area where you farted so you get the full blast of the stink. You usually realize before fully sitting down that it was a terrible idea, but by then it's too late to stand back up.
Andy-What's the matter? Did you sit on something? You look like your in pain.
Jeff- I just did a kamikaze drop, and I had tacos for lunch. This is not very pleasant.