Floyd Mayweather Claps Back at 50 Cent Over Gervonta Davis Diss

This might be the classiest clap back ever ... Floyd Mayweather subtly responding to 50 Cent after the rapper said Floyd's protege Gervonta Davis stole Mayweather's chick.

Earlier this week, 50 posted a video on social media saying he got a tip about someone who "took champ's bitch" -- and then identified the lady stealer as Davis.

"I don't know what the f**k," 50 said ... "Nelly took one of the bitches, Ray J took one of the bitches, now Gervonta done took one of the bitches. He bought the bitch a Bentley, Maybach, motherf**king condo and all that s**t. Now Gervonta got the bitch? N***a probably want to put a suicide note, man."

So, when we saw Floyd this week, we asked him about Gervonta --…