Floyd Mayweather is proving he's still in prime shape -- strip club shape, at least -- for his big comeback ... by getting right back in the strip club and throwing an INSANE amount of money!!
Of course, the 42-year-old boxing superstar announced he's returning to the fight game in 2020 ... and if his moves are as sharp as his throwing, his future opponents better watch out.
Money -- with endless stacks of $100 bills in hand --- made his presence known at G5ive in Miami on Tuesday night ... letting the cash fly as the dancers put on a show.