THUMPER
Etymology
Noun
thumper (plural thumpers)
One who thumps.
(slang) A single-cylinder engine, especially four-stroke engines or those with large engine displacements.
A particular drinking game wherein players must remember personal hand signs while being distracted by others' banging on a table.
(slang) Something big, such as a lie; a whopper.
(UK, rail, slang) A kind of slam-door train introduced in the late 1950s.
Source: Wiktionary
Thump"er, n.
Definition: One who, or that which, thumps.
Source: Webster’s Unabridged Dictionary 1913 Edition