whoopee cushion

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English Wikipedia has an article on:
An inflated whoopee cushion


whoopee cushion (plural whoopee cushions)

  1. An inflatable bag containing a valve at its neck that retains the air in the bag until pressure is put on it (usually by someone unintentionally sitting on it after it has been placed on a chair by someone else as a practical joke), when the air is expelled with a sound similar to that of someone farting (breaking wind).