whoopee cushion

noun
🔊/ˈwʊpi kʊʃn/
🔊/ˈwʊpi kʊʃn/
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  1. a rubber cushion that makes a noise like a fart when somebody sits on it, used as a joke放屁坐垫,屁袋(坐上去发出放屁声,开玩笑用)