thunderstick noun2 •A gun or cannon, especially a rifle, as seen from the imagined perspective of an uncivilized person or an animal.The man pointed his thunderstick at the buffalo, and with a great noise and fire, the buffalo fell down dead.We sneaked into the soldiers' camp, and stole five thundersticks. •A narrow plastic balloon that is used as a promotional noise maker by hitting one against another. formsthundersticks