Definition of super-duper adjective from the Oxford Advanced Learner's Dictionary

 

super-duper

 adjective
adjective
BrE BrE//ˌsuːpə ˈduːpə(r)//
 
, BrE//ˌsjuːpə ˈduːpə(r)//
 
; NAmE NAmE//ˌsuːpər ˈduːpər//
 
(old-fashioned, informal)
 
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excellent
See the Oxford Advanced American Dictionary entry: super-duper