jackeenEnglishOxford Dictionary of Englishjackeen /ˈdʒakiːn / ▸ noun Irish English mainly derogatory a Dubliner, especially as contrasted with a person from a rural area: a Dublin jackeen talking to a culchie from Connemara [as modifier] a thick jackeen accent. – ORIGIN early 19th century: diminutive of the pet name Jack(see jack1, -een).