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

 

def

 adjective
adjective
BrE BrE//def//
 
; NAmE NAmE//def//
 
(slang)
 
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excellent a def band Word Origin 1980s: probably an alteration of death (used in Jamaican English as an intensifier), or shortened from definitive or definite.
See the Oxford Advanced American Dictionary entry: def

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