The title of this article is a conjectural. Though the topic is found within The Simpsons universe, a proper name is not available.
The Whoopee Cushion couch gag is the first couch gag of Season 12.
Bart puts a whoopee cushion under Homer's spot. When the family sits down, Homer sits on it and triggers its farting sound. Homer grins sheepishly at Marge, Lisa, and Maggie (who are frowning) while Bart laughs.