Definition of BO noun from the Oxford Advanced Learner's Dictionary

 

BO

 noun
noun
BrE BrE//ˌbiː ˈəʊ//
 
; NAmE NAmE//ˈoʊ//
 
[uncountable]
 
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the abbreviation for body odour (an unpleasant smell from a person’s body, especially of sweat) She's got BO.
See the Oxford Advanced American Dictionary entry: BO