Definition of jackses:
(n) :
(games) A children's game involving picking up objects; knucklebones; jackstones.
(n) :
(poker slang) A pair of jacks.
(n) :
(UK, rhyming slang) Heroin tablets (from "jacks and jills" = pills)
(n) :
A surname originating as a patronymic derived from Jack.
(n) :
(slang, now chiefly Ireland) Alternative form of jakes: an outhouse or lavatory. [(now chiefly Ireland) A place to urinate and defecate: an outhouse or lavatory.]