MEANING: verb intr.: To seek attention by showy, flamboyant behavior; to show off.
noun: One who seeks attention in such a way; a show-off.

ETYMOLOGY: After riverboats, with onboard theater and troupes of actors, that stopped at towns along the river to offer entertainment. Earliest documented use: 1839.

SHOWBEAT - conduct the orchestra more vigorously

SHOPBOAT - I'll need to buy some stuff on my Caribbean cruise

SHOWBOUT - broadcast the Liston-Ali boxing match