HBY means "How About You?" The abbreviation HBY is typically used with the meaning "How About You?" as a response to a question. Looking for the definition of HBY? Find out what is the full meaning of HBY on Abbreviations. So now you know - HBY means "How About You?" - don't thank us. How Be You? Copyright 1988-2018 AcronymFinder. Get HBY : Full Form and its Definition.