Po·teen' noun [ Confer Ir. potaim , poitim , I drink, poitin a small pot.] Whisky; especially, whisky illicitly distilled by the Irish peasantry. [ Written also potheen , and potteen .] Found on http://www.encyclo.co.uk/webster/P/136
Irish term for illicit spirit made form malted barley occasionally from potatoes but more commonly made today from molasses. Found on https://www.classicwhiskey.com/glossary.htm