Trombone Share definition Flag 1) An english instrument originally called the sagbute (sackbutt) that makes many obsecene and beautiful noises. Often nicknamed, bone, boner, tromboner, horn, and noisy thing The Bones in the back row are blowing their minds out. Trombone by Emily April 27, 2004 0 0 Get merch Get the Trombone mug. Buy Now — $32.95 See more merch