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"Duodenum" is a song by Frank Zappa that first appeared as part of "Lumpy Gravy Part One" on 1968's Lumpy Gravy. It is an instrumental that runs for approximately 1:32 and is the second identifiable track, preceded by "The Way I See It, Barry" and followed by "Oh No". The duodenum, in anatomy, is part of the digestive system and connects the stomach to the small intestine.
Fillmore East - June 1971, released in 1971, contains a performance of "Duodenum" with added lyrics under the name "Bwana Dik". The song was used as part of a routine during which the band member most considerably endowed or popular with groupies was given the moniker "Bwana Dik".
"Duodenum" also appears in its instrumental form on the 1991 live double album Make a Jazz Noise Here as "Theme from Lumpy Gravy".