Charles Martinet, the voice actor of Mario and many other Super Mario series characters, had made a pretty interesting revelation.
When asked what Mario says in Super Mario 64 when he throws Bowser off the stage, Martinet confirmed Mario said “So long kinga Bowser!”, rather than “So long, Bowser!” or “So long, King Bowser!”:
So long kinga Bowser!
— Charles Martinet (@CharlesMartinet) April 29, 2019
Hopefully this puts many questions to rest on what Mario actually says in that moment.
What do you think?