Well, Floyd Mayweather's definitely eating like he's not coming back ...
The boxing legend pigged out like a maniac during a stop at Archie's Burgers and Shakes in Manchester, England yesterday ... stuffing himself with unhealthy deliciousness.
There are reports Mayweather is interested in bringing the restaurant chain to the US -- possibly opening one in Las Vegas.
And get this ... they've even got a dessert named after his pal Justin Bieber.
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