All eyes were on Jimmy Butler's butt Wednesday night ... 'cause his shorts had a dark yellow stain on 'em -- leading many to believe he had crapped himself mid-game.
The unfortunate scene for the new Warriors star played out as he and Golden State were fighting to pull off a win vs. the Mavericks at the American Airlines Center in Dallas.
Eagle-eyed viewers of the tilt noticed that as Butler was making a drive to the lane with the Dubs down 109-107 late in the fourth quarter .