burping bedpost
n.— «“The bassoon is one of the unsung heroes of the orchestra,” said Stanbery, who is also a bassoon player. “It’s sometimes called “a burping bedpost,” but we prefer to refer to it as the ‘king of instruments.’”» —“St. Julie Billiart Church hosts Tillmann Concert” by Richard O. Jones Oxford Press (Ohio) Nov. 16, 2006. (source: Double-Tongued Dictionary)