thumper

thump +‎ -er

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• Rhymes: -ʌmpə(ɹ)

thumper (countable and uncountable, plural thumpers)

1. One who thumps.
2. (slang) A single-cylinder engine, especially four-stroke engines or those with large engine displacements.
3. (uncountable) A drinking game wherein players must remember personal hand signs while being distracted by others banging on a table.
4. (slang) Something big, such as a lie; a whopper.
5. (UK, rail transport, slang) A kind of slam-door train introduced in the late 1950s.
6. (US, military, slang) The Vietnam-era M79 grenade launcher (due to its distinctive report).