As part of the V4.4 Content Update that just came out, Fortnite Added Stink Bombs. They also released a quick funny little video (watch below) to introduce it. These are now live and you can find them in Battle Royale.
Stink Bombs are Epic rarity and can be found from floor loot, chests, and vending machines. They release a stinky cloud with a 9-second duration that does 5 damage every half-second withing the cloud.
Watch the Fortnite Stink Bomb video from Epic Games:
Pass the gas! The Stink Bomb is now live, find it in-game!