Definition of zonked adjective from the Oxford Advanced Learner's Dictionary

 

zonked

 adjective
adjective
BrE BrE//zɒŋkt//
 
; NAmE NAmE//zɑːŋkt//
 
, NAmE//zɔːŋkt//
 
 
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[not before noun] zonked (out) (slang) extremely tired or suffering from the effects of alcohol or drugs
See the Oxford Advanced American Dictionary entry: zonked