Brown Cloud: Truely, a fart is a release of tiny poo particals into the air. Magnified, the particals create a, "brown cloud". So the next time you walk into a fart, remember to keep your mouth closed- otherwise you are injesting poo particals AKA brown cloud.
Next time you fart in a crowd, look around at those who are injesting last nights dinner, and celebrate silently.
"Hey dude, I just farted and everyone around me is standing in my brown cloud."
"My brown cloud has taste of last night's fried chicken!"