Bomb dropper

A person who enters a conversation for a very brief moment for one reason: to drop a fart. Bomb droppers will be at parties engaged in another conversation, when they feel the urge to fart, they excuse themselves from the conversation and casually saunter over to another conversation. At which point they start a pointless topic drop their 'bomb' and then leave, the people they briefly talked to are left with the overwhelming stench and the dropper can't be blamed for the bomb as they are miles away.