The phenomenon that occurs when someone breaks wind and then moves from the original location in which they committed their bottom bugle to a secondary position, in doing so dragging the aroma of the trouser trumpet from the first point to the next. A shit shadow is formed between the two points.
Also velcro fart.
Victim: "For pity's sake, have you just farted?"
Culprit: "Don't know what you're talking about"
Victim: "You liar. I've just walked through your shit shadow and it now smells of week old cauliflower in here."