Definition of butt ugly adjective from the Oxford Advanced Learner's Dictionary

 

butt ugly

 adjective
adjective
BrE BrE//bʌt ˈʌɡli//
 
; NAmE NAmE//bʌt ˈʌɡli//
 
(North American English, informal)
 
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(especially of a person) extremely unpleasant to look at