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

 

gobsmacked

 adjective
adjective
BrE BrE//ˈɡɒbsmækt//
 
; NAmE NAmE//ˈɡɑːbsmækt//
 
(British English, informal) Surprise
 
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so surprised that you do not know what to say I was gobsmacked when she told me the news. See related entries: Surprise Word Origin 1980s: from gob ‘mouth’ + smack ‘slap’, with reference to being shocked by a blow to the mouth, or to clapping a hand to one's mouth in astonishment.