The baddest woman on the planet ain't afraid of taking on Floyd Mayweather inside an MMA cage ... and she's laying out exactly how she'd smash him.
We spoke with UFC champ Cris Cyborg ahead of her 2nd title defense this weekend at UFC 222 ... and had to ask how she thinks she'd fare against Floyd, who's talked to Dana White about potentially taking a fight for the UFC.
Cyborg didn't back down -- telling TMZ Sports all the tools she'd have to bust out to put Mayweather to sleep.
Of course, that's a fantasy matchup we're never gonna see (well, maybe in Japan) ... so if ya wanna catch Cyborg, you're gonna have to tune in this Saturday when she scraps with Yana Kunitskaya.