"This is gonna be such a one-sided ridiculous ass-whoopin', it's not even gonna be funny."
That's Dana White pulling no punches on the upcoming Floyd Mayweather vs. Logan Paul fight ... warning to the YouTube star straight-up, YOU'RE GOING TO GET HURT.
"It's gonna be bad," White explained ... "I'm open for -- and I don't dislike any one of these kids ... but if Floyd Mayweather really shows up and goes in and fights this kid, it's gonna be an ass-whoopin' like nobody has ever seen before.