showboat

1. (US) A river steamboat having a resident theatre.Examples: "And Agnes Moorehead henpecks with stern persistence as Parthy, the captain's loving wife. The sets, which include a full-sized showboat with belching double stacks and sternwheel, are in the best Metro tradition, which means as sumptuous as sumptuous can be."; "Mr. Sterling was born in Baltimore on June 24, 1915, to Jack Sexton and Edna Cable, veteran performers in vaudeville, showboats and stock companies."; "Lowriding emerged in the 1950's in California, as Mexican-American youths -- in what may have been a reaction to the hot-rod culture dominated by whites -- transformed their cars into fantastical, ground-hugging showboats."US

2. (informal, chiefly US, by extension) A showoff.Examples: "Well, I was a little upset at first. I mean, obviously people are going to think I'm a showboat, and a little bit of a prick."; "After the President fired his FBI director in early May, he dismissed Comey as “a showboat,” “a grandstander” and a “nut job.”"USbroadlyinformal