Assflute

Assflute(ing) is the action of playing an average flute, or one specially designed and shaped for the purpose, with carefully controlled release of air, forced out by the sphincter, causing vibrations which create the sound on their own. However, when an assflute is docked to the anus, the vibrations start at the flute instead of the anus. Due to the difficulty of not only controlling the air flow from your anus, but also playing the flute without being able to see it.