thumper

Noun

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