- a boat, esp. a steamboat, containing a theater and carrying a troupe of actors who play river towns
- Slang a showoff; exhibitionist
Slang to show off
See showboat in American Heritage Dictionary 4
intransitive verb show·boat·ed
- A river steamboat having a troupe of performers and a theater aboard for performances on the river.
- One who seeks attention by ostentatious behavior; a showoff.
To show off.
Learn more about showboat