A hashtag word or phrase on twitter used to bash a particular celebrity, company, product, or lifestyle, often going viral. Usually they originate from funny running jokes, though sometimes they originate from a company's own marketing hashtag gone awry. Examples include #Drakethetype, #McDstories, #qantasluxury, #AskJPM
#Drakethetype might just be the funniest bashtag of 2013.
#QantasLuxury quickly turned from a corporate marketing tag to a bashtag after they stranded 80,000 people around the world.