A fart - but more specifically a particularly loud, long and smelly fart.
Ell: Jeez whats that noise.....oh bloody hell someone open a door what IS that?
Livy: it's just Isa playing the bum trumpet - chill dad!
by Lazyfatbitch December 30, 2016
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An extremely loud fart made deliberately
Johnny let out a bum trumpet while sitting on the couch with his sister.
by cold_eyes May 31, 2014
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To fart bubbles of semen after an act of anal love-making.
My boyfriend blasted me with such a huge load last night I’m still playing the spunky bum trumpet.
by Harry Sausage January 14, 2005
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Used to describe someone who farts alot.
Oh, gezzz... you trumpet bum!
by az_oz December 12, 2005
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