What is "drummingly"

Usage examples of "drummingly".

On the long table two blue-boiled cucurbits bubbled and roiled, their heads shooting out a solid, writhing rope more swiftly than moves the black swamp-cobra, which can run down a man and not into twin receivers, but into the open air of the room (if any of the air in Thieves' House could have been called open then) to weave a barrier between their swords and Hristomilo, who once more stood tall though hunch-backed over his sorcerous, brown parchment, though this time his exultant gaze was chiefly fixed on Fafhrd and the Mouser, with only an occasional downward glance at the text of the spell he drummingly intoned.