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