thumper

noun9

1. •
   One who thumps.
2. •
   (informal) A strong adherent to a religion or ideology.

   • But in spite of the antics of its Bible thumpers and its boobocracy, my father was unable to stay mad at the United States for long. — 1984
3. •
   (slang) A single-cylinder engine, especially four-stroke engines or those with large engine displacements.
4. •
   (slang) Something big, such as a lie; a whopper.
5. •
   (US, slang) The Vietnam-era M79 grenade launcher (due to its distinctive report).
6. •
   (informal) A track with a thumping beat.
7. •
   A drinking game wherein players must remember personal hand signs while being distracted by others banging on a table.
8. •
   (UK, slang) A kind of slam-door train introduced in the late 1950s.
9. •
   A short rope for beating disobedient sled dogs.