piddle

Unknown. Compare regional German piddlen, pitteln, pütteln, pühteln (“to pick at something, pick at one's food”), dialectal German Pitzel (“small effort, small task”). Alternatively, perhaps originally from paw or put + -le (suffix forming verbs involving continuous or repeated movement). In later use, a euphemistic diminutive of piss, though not directly related to it. The noun derives from the verb.