The characters BYM can mean Baltimore Yearly Meeting Britain Yearly Meeting, both organizational structures of the Religious Society of Friends (Quakers) Bais Yaakov Machon, a High School for Jewish girls in Queens, New York City. BYM is the international code for Bayamo (Cuba) Civil Airport. Backyard Monsters BYM stands for Bright Yellow Mini as in a Liquid Yellow 2002-2006 Mini Cooper S automobile.