Poundtown is the weapon of Yoguk Gro-Shal. It is a flak cannon that he has turned into a makeshift firearm, and has carried it ever since he was a youth, fighting to survive on Wrothgaria. It is an unwieldy, incredibly heavy weapon, inaccurate, and short-of-range, but a single blast from it can cut a person in half.
Given Yoguk's current profession, it has been collecting dust in the back of his closet for some time.