Neymar Cusses Out Costa Rica Players, 'Puta'

Brazilian soccer superstar Neymar got so pissed off the pitch Friday, he cussed out some of his opponents -- insulting their mothers -- and it was broadcast for the world to see.

Neymar and Brazil were taking on Costa Rica in a World Cup Group E game in Russia -- it was very chippy and Neymar was getting VERY frustrated.

So, when a Costa Rica guy appeared to flop -- again -- Neymar let him have it ... calling the dude a "puta" and muttering something about the guy's "madre."

Translation -- the insult is akin to someone calling your mother a whore or a bitch ... you get it.

Soccer players talking trash is nothing new -- but Neymar is one of the biggest, most famous players on the planet ... it would be like watching LeBron cuss out an opponent during the NBA Finals.