Tuba Butt 

A condition of bad flatulence when the farts resonate similar to the sound of a deep tuba instrument. The sound is so close to that of a real tuba that the farter should seriously consider trying out as a tuba player in the orchestra. Tuba Butt is particular hysterical when combined with a Toilet Fart because of the ceramic echo effect of the bowl.

1) Haha, Teddy has tuba butt - watchya doing there Teddy? Trying out for the orchestra with your farts?

2) I heard Billy just got hired by the orchestra because of his amazing tuba butt.

Tuba Butt by chr0meice91 April 20, 2022

Butt Tuba 

a tuba inserted into the rear end of a person by means of entertainment, or punishment.

Dylan's parents were so angry at him, they punished him by use of a butt tuba.

Joey's friends wanted to laugh at him, so they gave him a butt tuba.

Butt Tuba by Joe Dylan Pudding June 25, 2009