A loud but musical breaking of wind, or fart.
"As a hush descended on the dinner room at Hogwarts, just as Dumbledor rose to speak a sudden sharp trouser trumpet honked into the air. Ron Weasley looked as red as a beetroot; In fact, it was Hermione who in typical muggle fashion had done it, but was willing to pass it on to Ron."
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Nasty name for someone who makes nasty smells from their posterior! Also a common name for Master Peters!
Oy trumpet trousers u stinky S**t!
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Man that guy's a trumpet trousers. His farts stink!
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