jackies

from The Collaborative International Dictionary of English v.0.48

Jacky \Jack"y\, n.; pl. {Jackies}.
   Dim. or pet from {Jack}. Hence:
   (a) A landsman's nickname for a seaman, resented by the
       latter.
   (b) English gin. [Dial. Eng.]
       [Webster 1913 Suppl.]