The title of this article is a conjectural. Though the topic is found within The Simpsons universe, a proper name is not available.
The Blue Man Group couch gag is the eighth couch gag of Season 13.
The family runs in to find the Blue Man Group performing on drums in front of the couch. Homer murmurs "What the...?" (in reruns and repeats of this couch gag in other episodes, The Blue Man Group plays more louder and harder and Homer's "What the...?" is muted out)