Blackfuse Bombling

Source
This item drops from Siegecrafter Blackfuse in Siege of Orgrimmar.

It also has a chance to be listed on the Black Market Auction House by Jasper Fel, for the opening bid of.

Pet Journal
The first bombling created in the Underhold, Siegecrafter Blackfuse couldn't bear to see it destroyed, and kept it as a friendly, if explosive, pet.