The gas experienced en masse by travelers, after an airline flight during which peanuts are the only "food" available.
Characterized by their own unmistakable, unique aroma. Can also occur during other times not related to air travel.
Bob: Duuuude! I ate all the Snickers and Baby Ruths from the kids' Halloween bags, and now I have wicked airplane farts!
Tom: (wafting the air) Dude! I noticed!