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The only logical assessment I could make all this time is that he was throwing out an exaggerated "e" (pronounced as you typically would in "Pokémon") sound at the end of "long" as a stereotypical Italian-esque flourish. Just a bit of playful accenting. "So longé Bowser!"
Another somewhat reasonable suggestion I've heard is that it's a chummy taunt in the form of a question from Mario: "So long, eh Bowser?"
Anything else I've seen is completely out of touch with the actual voice clip to a degree that astonishes me. People pulling sounds and syllables from nowhere.
He is definitely not saying "Kinga". (Unless it was edited out after the recording session, which is weird but possible.)