Definition of bitchin’ adjective from the Oxford Advanced Learner's Dictionary

 

bitchin’

 adjective
(also bitching)adjective
BrE BrE//ˈbɪtʃɪn//
 
; NAmE NAmE//ˈbɪtʃɪn//
 
(slang, especially North American English)
 
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very good
See the Oxford Advanced American Dictionary entry: bitchin’