thumper
n.— «Originally the designers wanted to mount a “long tom” or a “thumper” as the mech’s “main gun” but these proved far too “large” so they settled for the Schlong 2,000 Large Pulse Laser.» —“New Cappellan Mech!” by Brandon Ivie (bji6049@u.cc.utah.edu) Usenet: rec.games.mecha Oct. 18, 1995. (source: Double-Tongued Dictionary)
Further reading
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