Stink Bombs were first mentioned in Nightfall, when Dex said, "I could bottle that smell and make the ultimate stink bomb, but I'm a little afraid of what would happen if Keefe got ahold of it." To Sophie.
They are again mentioned when Kesler uses them to clear the crowds away from the Unity Statue. Keefe describes the stink as "A thousand Gulon farts baking in the sun." The elves in Atlantis seem to think that the smell is equally unpleasant because they hurry away very quickly.