50 Centsays there's one guy he'd love to punch in the face -- Floyd Mayweather-- but he doesn't think Floyd would ever agree to throw down.
Everyone knows the backstory ... 50 and Floyd used to be super tight -- but they've had SEVERAL falling outs over the years and it seems like the relationship is still fractured.
So, when 50 appeared on V-103's "The Morning Culture" show Friday and was asked who he'd like to square off against in a celebrity boxing match, it wasn't too shocking when the rapper dropped Floyd's name.
"I'd fight Floyd," 50 Cent said ... adding, "I don't think I can make weight though."
50 pointed out Floyd usually fights around 150 lbs -- and the 45-year-old rapper says there's just no way he can slim down to match Floyd's weight.
50 claims the last time he dropped to 150, "I looked like a homeless person."