anal napalm
A bodily substance (solid or liquid) the exits the anus with such a horrid odor, that most living things are forced to run away for their own survival. The odor is so dense that it sticks to your clothes, causes shortness of breath, and watery eyes. The culprit is usually a virus found in contaminated Central American or Asian food.
Dude just dropped anal napalm and then ran to the restroom while the rest of us were left gagging.