BO /ˌbiː ˈəʊ $ -ˈoʊ/ noun [uncountable]
(body odour) an unpleasant smell from someone’s body caused by sweat

[TahlilGaran] Dictionary of Contemporary English ▲

BO
Body Odor - smell of sweat from the human body
The BO from the man in the elevator was very bad.

[TahlilGaran] English Idioms Dictionary ▲

BO
Back Orifice 
Body Odor 
Bottom Opened (can collectors) 
Box Office 
Burnout 
Buzz Off

[TahlilGaran] Acronyms and Abbreviations Dictionary ▲

B.O.
Buyer's option, Branch Office

[TahlilGaran] Acronyms and Abbreviations Dictionary ▲