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

 

prig

 noun
noun
BrE BrE//prɪɡ//
 
; NAmE NAmE//prɪɡ//
 
(disapproving)
 
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a person who behaves in a morally correct way and who shows that they disapprove of what other people do Word Origin mid 16th cent.: of unknown origin. The earliest sense was ‘tinker’ or ‘petty thief’, which led to the sense ‘disliked person’, especially ‘someone who is affectedly and self-consciously precise’ (late 17th cent.).
See the Oxford Advanced American Dictionary entry: prig