The story
Blend of trombone + bassoon, humorously coined by composer Peter Schickele, attributed to fictitious composer P. D. Q. Bach.
Etymology from Wiktionary, CC BY-SA 4.0.
tromboon
Today it means: A trombone with the reed and bocal of a bassoon placed instead of the usual mouthpiece, which combines the limitations of both instruments, producing a loud comical sound. Full definition →