Definition of BYO abbreviation from the Oxford Advanced Learner's Dictionary

 

BYO

 abbreviation
abbreviation
BrE BrE//ˌbiː waɪ ˈəʊ//
 
; NAmE NAmE//ˌbiː waɪ ˈoʊ//
 
(also BYOB
BrE BrE//biː ˌwaɪ əʊ ˈbiː//
 
; NAmE NAmE//biː ˌwaɪ ˈbiː//
 
)
 
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(used in invitations to parties, notices in restaurants, etc.) bring your own (bottle/beer)