What is the meaning of song Booyaka 619?

"Booyaka 619" is a professional wrestling catchphrase popularised by American wrestler Rey Mysterio. The catchphrase is a combination of the words "booyaka", which is a meaningless exclamation, and "619", which refers to the area code of San Diego, California, where Mysterio was born. The catchphrase is often used by Mysterio to hype up the crowd before his matches and is also the title of his entrance music.