thumper
n.β Β«They key to shooting any powerful gun, and especially a thumper, is to roll with it, not fight it.Β» ββRe: HARD KICKING 45-70βs & 444 Marlins” by Ken Marsh (kmarsh@charm.net) Usenet: rec.guns June 16, 1996. (source: Double-Tongued Dictionary)