After Mayweather revealed his new pet -- Teigen went to Twitter and wrote, "I'm okay with people having pet tigers because it increases their chances of being eaten by a tiger."
Well, Floyd no likey -- 'cause he just appeared on FightHype.com and fired off some not-so-subtle insults right back at her.
"John Legend's wife said something? I've never had anything negative to say about John Legend. I really don't even know what his wife does."
And then the worst insult a supermodel can get -- "I never seen John Legend's wife in my life. And if I did I probably just don't remember it."
For the record, Mayweather promises he'll be responsible with his new pets -- "I'm not getting a tiger to let my tiger run around the city and bite people. We're trying to help save tigers."