tub thumper
/ˈtʌbˌθʌmpər/
noun
- A person who speaks loudly and forcefully in public, especially about politics or religion, often in a way that is seen as aggressive or overly emotional.
- My uncle is a tub-thumper who loves to argue about politics at family dinners.
- The preacher was a tub-thumper, pounding the pulpit and making the congregation cheer.
- The candidate was a real tub-thumper, shouting his promises from every street corner.