noun. A low-ranking fruit indeed.
Real citation: “And right atop the letters list was one from SAG First VP and second, less entertaining "M*A*S*H" sidekick Mike Farrell, who naturally thinks the plight of the seventeenth banana is a major problem:”
(Dec. 5, 2004, PMSimon.com, http://www.pmsimon.com/archives/week_2004_12_05.html)
Made-up citation: “If I had a squadron of minions and henchgoons, I’d require the seventeenth banana to keep my compound well-stocked with bananas—and to be on the lookout for traitorous henchapes.”