Definition of jacksie noun from the Oxford Advanced Learner's Dictionary

 

jacksie

 noun
(also jacksy)noun
BrE BrE//ˈdʒæksi//
 
; NAmE NAmE//ˈdʒæksi//
 
(British English, informal)
 
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your bottom (= the part of your body that you sit on) Word Origin late 19th cent.: diminutive of jack.