Y4M Full Form. Full Meaning of Y4M Find long form and abbreviation, slang or definition of Y4M. What does Y4M mean? What does Y4M 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.