Ronaldinho -- King of Brazil ... Butts

Brazilian soccer legend Ronaldinho isn't afraid of a little 5 on 1 .. especially when the 5 are in thongs.

A photo of the 33-year-old goal scoring machine has surfaced showing a handful of ladies showing off their plump Brazilian backsides in a pool while Ronaldinho strikes his best "Statue of the Redeemer" pose.

It's unclear when or where the photo was taken ... but really, does it even matter?