Walking Bomb

From WoWWiki

Mekgineer Thermaplugg's obsession for explosives shows, for whenever he is threatened, the many bomb machines start up and begin producing explosive protectors, the Bom Bots or Walking Bombs, for their master. Be wary of these machines, and deactivate them as soon as Thermaplugg starts them up with a bolt of electricity from his Mechanical Battle-Mount that he is never without. Be sure to close these machines by pressing the buttons located on the sides immediately.

These Bom Bots are bigger versions of the Goblin Engineer made Pet Bombling.

Some players believe that the Bom Bots are a reference to the Bob-omb enemies from the Mario games.