Floyd Mayweather is wasting no time unloading the hundreds of millions he won less than a month ago ... plunking down $25.5 million on a Beverly Hills mansion.
The 15,000 sq ft home features 6 bedrooms, 10 bathrooms, a wine cellar and a guest house with a movie theater. The crib was built by developer Nile Niami and also features an incredible backyard pool for when Floyd wants some r&r.
Floyd's been on a tear since taking down Conor McGregor ... he also spent a quarter million on Birkin bags during a shopping spree with hot chicks last week.