whoopee cushion 
noun
A rubber cushion that makes a sound like the breaking of wind when someone sits on it.The wife is quite short, and runs excitedly around the shop trying to sell you a rubber rat, a whoopee cushion, or spicy hot chewing gum....
- The largest simultaneous Whoopee Cushion Sit saw a total of 1,372 people sit on whoopee cushions simultaneously at the Gala opening of the 2003 Brighton Comedy Festival on October 10, 2003.
- Fans of the Beano and Dandy are playing a host of tricks on unsuspecting customers, the Diary learns: fake dog poo, bangers in cigarettes, whoopee cushions, vile sweets and itching powder included.
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