YAY Views 7 meanings found YAY appears both as a playful exclamation and as a shorthand for Yet Another YACC in computing, while community programs sometimes adopt it for Youth Assisting Youth initiatives. Miscellaneous Yet Another YACC Yvonne Ariel and Yvette Community Youth Assisting Youth International YAYinlari YAYini Regional St. Anthony, Newfoundland, Canada Computing Yet Another YACC (Yet Another Compiler Compiler)