Definition of blankety-blank adjective from the Oxford Advanced American Dictionary

 

blankety-blank

 adjective
adjective
NAmE//ˌblæŋkət̮i ˈblæŋk//
 
[only before noun](informal)
 
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used in place of a rude word that the speaker does not want to say It's not my blankety-blank fault!
See the Oxford Advanced Learner's Dictionary entry: blankety-blank