BIY Full Form. Full Meaning of BIY Find long form and abbreviation, slang or definition of BIY. What does BIY mean? What does BIY stand for? We are providing world largest and most comprehensive acronyms, names, abbreviations database directory on the Internet. Our data base contains more than 8,00,000 terms abbreviations and acronyms. You can also search unique terms more than 4,00,000 general Comprehensive words.