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