The whoopee cushion has reportedly been used since ancient times. Roman boy-emperor Elagabalus, for example, was said to enjoy practical jokes at his dinner parties and would often place whoopee cushions under the chairs of his more pompous guests.[1] The modern version was invented in the 1920s by the JEM Rubber Co. of Toronto, Ontario, Canada, by employees who were experimenting with scrap sheets of rubber.[2] The owner of the company approached Samuel Sorenson Adams, the inventor of numerous practical jokes and owner of S.S. Adams Co., with the newly invented item. Adams said that the item was "too vulgar" and would never sell. JEM Rubber offered the idea to the Johnson Smith Company which sold it with great success. S.S. Adams Co. later released its own version, but called it the "Razzberry Cushion."[2]
If we believe Wikipedia.
She chose the name for performing, so she at one point in time must have realised it was wise to hitch her star on a fart gag.
She may as well be farting everytime she opens her mouth today as that might at least be funny but no cushion for her.