Definition of sugar exclamation from the Oxford Advanced Learner's Dictionary

 

sugar

 exclamation
exclamation
BrE BrE//ˈʃʊɡə(r)//
 
; NAmE NAmE//ˈʃʊɡər//
 
 
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used to show that you are annoyed when you do something stupid or when something goes wrong (to avoid saying shit) Oh sugar! I've forgotten my book! Word Origin Middle English: from Old French sukere, from Italian zucchero, probably via medieval Latin from Arabic sukkar.
See the Oxford Advanced American Dictionary entry: sugar