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Also, top dog. The principal person in a group, organization, or undertaking, as in His plan was to be top banana within ten years, or Now that she's top dog you can't get hold of her at all. The first term comes from show business, where from the early 1900s it has signified the leading comedian (possibly the original allusion was to Frank Lebowitz, a burlesque comedian who used bananas in his act). It also gave rise to second banana, for a supporting actor, usually a straight man. Both were transferred to more general use in the second half of the 1900s, as in executive Peter Barton's statement, "There is a certain pain to being a second banana, but you have to have an ability to sublimate your ego," quoted in The New York Times, May 15, 1996. The variant, top dog, originated in sports in the late 1800s and signified the odds-on favorite or winner in a contest; it alludes to the dog who wins (comes out on top) in a dogfight.
top bananathe most important person in an organization or activity. informal, chiefly North American
The two expressions above originated in US theatrical slang. The top banana was originally the comedian who topped the bill in a show, while the second banana was the supporting comedian.
1. n. the lead comedian in a burlesque or vaudeville act. The top banana didn’t show up for the gig.
Headliner comedian in a vaudeville show. The phrase is said to have originated with a vaudevillian named Harry Steppe in 1927 from a skit in which three comics tried to figure out how to share two bananas. Steppe also claimed to have first used “second banana” to refer to the cast's number two comic. Comedian Phil Silvers popularized the phrase “Top Banana” when he used it as the title of his Broadway musical and movie.