The title of this article is a conjectural. Though the topic is found within The Simpsons universe, a proper name is not available.
The Wave couch gag is the fourteenth couch gag of Season 8.
The couch is on the deck of a ship at sea in rough waters, sliding back and forth with the tilt of the ship. The family, dressed in raingear, sits on the couch, before an enormous wave washes them away. The TV surfaces moments later.