It has also been said that it may come from the Irish words dÃ daire or dÃ idire . This means ` trumpeter ; constant smoker , puffer ; long-necked person , eavesdropper ; hummer , crooner ' and dubh , meaning `` black '' ( or duth , meaning `` native '' ) . It has also been suggested that it may be derived from the Irish words dÃ daire or dÃ idire , meaning variously ` trumpeter ; constant smoker , puffer ; long-necked person , eavesdropper ; hummer , crooner ' and dubh , meaning `` black '' ( or dÃ th , meaning `` native '' ) .