I think there's only 3 people that would know what he said.
Mayweather Jr himself, Victor Ortiz, and Joe Cortez. That's if he said anything.
To me it looks like he just put so much force in to the left hook, and pivoted with it so much, that his mouth opened. Throw a quick, hard left hook to the air and you'll see what it means.
Then again maybe he just said a curse word, who knows.
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